《金融投资学》教学资源（英文文献）Market Microstructure

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Market Microstructure Hans R.Stoll Market microstructure deals with the purest form of financial intermediation--the trading of a financial asset,such as a stock or a bond.In a trading market,assets are not transformed(as they are,for example,by banks that transform deposits into loans)but are simply transferred from one investor to another.The financial intermediation service provided by a market,first described by Demsetz(1968)is immediacy.An investor who wishes to trade immediately-a demander of immediacy-does so by placing a market order to trade at the best available price-the bid price if selling or the ask price if buying.Bid and ask prices are established by suppliers of immediacy.Depending on the market design,suppliers of immediacy may be professional dealers that quote bid and ask prices or investors that place limit orders,or some combination. Investors are involved in three different markets-the market for information,the market for securities and the market for transaction services.Market microstructure deals primarily with the market for transaction services and with the price of those services as reflected in the bid-ask spread and commissions.The market for securities deals with the determination of securities prices.The literature on asset pricing often assumes that markets operate without cost and without friction whereas the essence of market microstructure research is the analysis of trading costs and market frictions.The market for information deals with the supply and demand of information,including the incentives of securities analysts and the adequacy of information.This market,while conceptually separate,is closely linked to the market for transaction services since the difficulty and cost of a trade depends on the information possessed by the participants in the trade. Elements in a market are the investors who are the ultimate demanders and suppliers of immediacy,the brokers and dealers who facilitate trading,and the market facility within which trading takes place.Investors include individual investors and institutional investors such as pension plans and mutual funds.Brokers are of two types: upstairs brokers,who deal with investors,and downstairs brokers,who help process transactions on a trading floor.Brokers are agents and are paid by a commission.Dealers 1

1 Market Microstructure Hans R. Stoll Market microstructure deals with the purest form of financial intermediation -- the trading of a financial asset, such as a stock or a bond. In a trading market, assets are not transformed (as they are, for example, by banks that transform deposits into loans) but are simply transferred from one investor to another. The financial intermediation service provided by a market, first described by Demsetz (1968) is immediacy. An investor who wishes to trade immediately – a demander of immediacy – does so by placing a market order to trade at the best available price – the bid price if selling or the ask price if buying. Bid and ask prices are established by suppliers of immediacy. Depending on the market design, suppliers of immediacy may be professional dealers that quote bid and ask prices or investors that place limit orders, or some combination. Investors are involved in three different markets – the market for information, the market for securities and the market for transaction services. Market microstructure deals primarily with the market for transaction services and with the price of those services as reflected in the bid-ask spread and commissions. The market for securities deals with the determination of securities prices. The literature on asset pricing often assumes that markets operate without cost and without friction whereas the essence of market microstructure research is the analysis of trading costs and market frictions. The market for information deals with the supply and demand of information, including the incentives of securities analysts and the adequacy of information. This market, while conceptually separate, is closely linked to the market for transaction services since the difficulty and cost of a trade depends on the information possessed by the participants in the trade. Elements in a market are the investors who are the ultimate demanders and suppliers of immediacy, the brokers and dealers who facilitate trading, and the market facility within which trading takes place. Investors include individual investors and institutional investors such as pension plans and mutual funds. Brokers are of two types: upstairs brokers, who deal with investors, and downstairs brokers, who help process transactions on a trading floor. Brokers are agents and are paid by a commission. Dealers

trade for their own accounts as principals and earn revenues from the difference between their buying and selling prices.Dealers are at the heart of most organized markets.The NYSE(New York Stock Exchange)specialist and the Nasdaq(National Association of Securities Dealers Automated Quotation)market makers are dealers who maintain liquidity by trading with brokers representing public customers.Bond markets and currency markets rely heavily on dealers to post quotes and maintain liquidity The basic function of a market-to bring buyers and sellers together--has changed little over time,but the market facility within which trading takes place has been greatly influenced by technology.In 1792,when the New York Stock Exchange was founded by 24 brokers,the market facility was the buttonwood tree under which they stood.Today the market facility,be it the NYSE,Nasdaq or one of the new electronic markets,is a series ofhigh-speed communications links and computers through which the large majority of trades are executed with little or no human intervention.Investors may enter orders on-line,have them routed automatically to a trading location and executed against standing orders entered earlier,and automatically sent for clearing and settlement. Technology is changing the relationship among investors,brokers and dealers and the facility through which they interact. Traditional exchanges are membership organizations for the participating brokers and dealers.New markets are computer communications and trading systems that have no members and that are for-profit businesses,capable in principal of operating without brokers and dealers.Thus while the function of markets-to provide liquidity to investors -will become increasingly important as markets around the world develop,the exact way in which markets operate will undoubtedly change. The field of market microstructure deals with the costs of providing transaction services and with the impact of such costs on the short run behavior of securities prices. Costs are reflected in the bid-ask spread(and related measures)and commissions.The focus of this chapter is on the determinants of the spread rather than on commissions. After an introduction to markets,traders and the trading process,I review the theory of the bid-ask spread in section II and examine the implications of the spread for the short run behavior of prices in section III.In section IV,the empirical evidence on the magnitude and nature of trading costs is summarized,and inferences are drawn about the 2

2 trade for their own accounts as principals and earn revenues from the difference between their buying and selling prices. Dealers are at the heart of most organized markets. The NYSE (New York Stock Exchange) specialist and the Nasdaq (National Association of Securities Dealers Automated Quotation) market makers are dealers who maintain liquidity by trading with brokers representing public customers. Bond markets and currency markets rely heavily on dealers to post quotes and maintain liquidity. The basic function of a market – to bring buyers and sellers together -- has changed little over time, but the market facility within which trading takes place has been greatly influenced by technology. In 1792, when the New York Stock Exchange was founded by 24 brokers, the market facility was the buttonwood tree under which they stood. Today the market facility, be it the NYSE, Nasdaq or one of the new electronic markets, is a series of high-speed communications links and computers through which the large majority of trades are executed with little or no human intervention. Investors may enter orders on-line, have them routed automatically to a trading location and executed against standing orders entered earlier, and automatically sent for clearing and settlement. Technology is changing the relationship among investors, brokers and dealers and the facility through which they interact. Traditional exchanges are membership organizations for the participating brokers and dealers. New markets are computer communications and trading systems that have no members and that are for-profit businesses, capable in principal of operating without brokers and dealers. Thus while the function of markets – to provide liquidity to investors – will become increasingly important as markets around the world develop, the exact way in which markets operate will undoubtedly change. The field of market microstructure deals with the costs of providing transaction services and with the impact of such costs on the short run behavior of securities prices. Costs are reflected in the bid-ask spread (and related measures) and commissions. The focus of this chapter is on the determinants of the spread rather than on commissions. After an introduction to markets, traders and the trading process, I review the theory of the bid-ask spread in section II and examine the implications of the spread for the short run behavior of prices in section III. In section IV, the empirical evidence on the magnitude and nature of trading costs is summarized, and inferences are drawn about the

importance of various sources of the spread.Price impacts of trading from block trades, from herding or from other sources,are considered in section V.Issues in the design of a trading market,such as the functioning of call versus continuous markets and of dealer versus auction markets,are examined in section VI.Even casual observers of markets have undoubtedly noted the surprising pace at which new trading markets are being established even as others merge.Section VII briefly surveys recent developments in U.S securities markets and considers the forces leading to centralization of trading in a single market versus the forces leading to multiple markets.Most of this chapter deals with the microstructure of equities markets.In section VIll,the microstructure of other markets is considered.Section IX provides a brief discussion of the implications of microstructure for asset pricing.Section X concludes. Markets,traders and the trading process. I.A.Types of markets. It is useful to distinguish major types of market structures,although most real-world markets are a mixture of market types.An important distinction is between auction and dealer markets.A pure auction market is one in which investors(usually represented by a broker)trade directly with each other without the intervention of dealers.A call auction market takes place at specific times when the security is called for trading.In a call auction,investors place orders-prices and quantities-which are traded at a specific time according to specific rules,usually at a single market clearing price.For example, the NYSE opens with a kind of call auction market in which the clearing price is set to maximize the volume of trade at the opening. While many markets,including the NYSE and the continental European markets, had their start as call auction markets,such markets have become continuous auction markets as volume has increased.In a continuous auction market,investors trade against resting orders placed earlier by other investors and against the "crowd"of floor brokers. Continuous auction markets have two-sides:Investors,who wish to sell,trade at the bid For other overviews of the field of market microstructure,see Madhavan(2000),the chapter in this volume by Easley and O'Hara,and O'Hara(1995)

3 importance of various sources of the spread. Price impacts of trading from block trades, from herding or from other sources, are considered in section V. Issues in the design of a trading market, such as the functioning of call versus continuous markets and of dealer versus auction markets, are examined in section VI. Even casual observers of markets have undoubtedly noted the surprising pace at which new trading markets are being established even as others merge. Section VII briefly surveys recent developments in U.S securities markets and considers the forces leading to centralization of trading in a single market versus the forces leading to multiple markets. Most of this chapter deals with the microstructure of equities markets. In section VIII, the microstructure of other markets is considered. Section IX provides a brief discussion of the implications of microstructure for asset pricing. Section X concludes.1 I. Markets, traders and the trading process. I.A. Types of markets. It is useful to distinguish major types of market structures, although most real-world markets are a mixture of market types. An important distinction is between auction and dealer markets. A pure auction market is one in which investors (usually represented by a broker) trade directly with each other without the intervention of dealers. A call auction market takes place at specific times when the security is called for trading. In a call auction, investors place orders – prices and quantities – which are traded at a specific time according to specific rules, usually at a single market clearing price. For example, the NYSE opens with a kind of call auction market in which the clearing price is set to maximize the volume of trade at the opening. While many markets, including the NYSE and the continental European markets, had their start as call auction markets, such markets have become continuous auction markets as volume has increased. In a continuous auction market, investors trade against resting orders placed earlier by other investors and against the “crowd” of floor brokers. Continuous auction markets have two-sides: Investors, who wish to sell, trade at the bid 1 For other overviews of the field of market microstructure, see Madhavan (2000), the chapter in this volume by Easley and O’Hara, and O’Hara (1995)

price established by resting buy orders or at prices in the "crowd,"and investors,who wish to buy,trade at the asking price established by resting sell orders or at prices in the "crowd."The NYSE is said to be a continuous auction market with a"crowd".Electronic markets are continuous auction markets without a"crowd." A pure dealer market is one in which dealers post bids and offers at which public investors can trade.The investor cannot trade directly with another investor but must buy at the dealers ask and sell at the dealers bid.Bond markets and currency markets are dealer markets.The Nasdaq Stock Market started as a pure dealer market,although it now has many features of an auction market because investors can enter resting orders that are displayed to other investors. Dealer markets are physically dispersed and trading is conducted by telephone and computer.By contrast,auction markets have typically convened at a particular location such as the floor of an exchange.With improvements in communications technology,the distinction between auction and dealer markets has lessened.Physical centralization of trading on an exchange floor is no longer necessary.The purest auction market is not the NYSE,but an electronic market(such as Island or the Paris Bourse)that takes place in a computer.The NYSE,in fact is a mixed auction/dealer market because the NYSE specialist trades for his own account to maintain liquidity in his assigned stocks.The Nasdaq Stock market is in fact also a mixed dealer/auction market because public orders are displayed and may be executed against incoming orders. I.B.Types of orders The two principal types of orders are a market order and a limit order.A market order directs the broker to trade immediately at the best price available.A limit order to buy sets a maximum price that will be paid,and a limit order to sell sets a minimum price that will be accepted.In a centralized continuous auction market,the best limit order to buy and the best limit order to sell(the top of the book)establish the market,and the quantities at those prices represent the depth of the market.Trading takes place as incoming market orders trade with the best posted limit orders.In traditional markets, dealers and brokers on the floor may intervene in this process.In electronic markets the process is fully automated

4 price established by resting buy orders or at prices in the “crowd,” and investors, who wish to buy, trade at the asking price established by resting sell orders or at prices in the “crowd.” The NYSE is said to be a continuous auction market with a “crowd”. Electronic markets are continuous auction markets without a “crowd.” A pure dealer market is one in which dealers post bids and offers at which public investors can trade. The investor cannot trade directly with another investor but must buy at the dealers ask and sell at the dealers bid. Bond markets and currency markets are dealer markets. The Nasdaq Stock Market started as a pure dealer market, although it now has many features of an auction market because investors can enter resting orders that are displayed to other investors. Dealer markets are physically dispersed and trading is conducted by telephone and computer. By contrast, auction markets have typically convened at a particular location such as the floor of an exchange. With improvements in communications technology, the distinction between auction and dealer markets has lessened. Physical centralization of trading on an exchange floor is no longer necessary. The purest auction market is not the NYSE, but an electronic market (such as Island or the Paris Bourse) that takes place in a computer. The NYSE, in fact is a mixed auction/dealer market because the NYSE specialist trades for his own account to maintain liquidity in his assigned stocks. The Nasdaq Stock market is in fact also a mixed dealer/auction market because public orders are displayed and may be executed against incoming orders. I.B. Types of orders The two principal types of orders are a market order and a limit order. A market order directs the broker to trade immediately at the best price available. A limit order to buy sets a maximum price that will be paid, and a limit order to sell sets a minimum price that will be accepted. In a centralized continuous auction market, the best limit order to buy and the best limit order to sell (the top of the book) establish the market, and the quantities at those prices represent the depth of the market. Trading takes place as incoming market orders trade with the best posted limit orders. In traditional markets, dealers and brokers on the floor may intervene in this process. In electronic markets the process is fully automated

In a pure dealer market,limit orders are not displayed but are held by the dealer to whom they are sent,and market orders trade at the dealers bid or ask,not with the limit orders.In some cases,such as Nasdag before the reforms of the mid 1990s,a limit order to buy only executes if the dealer's ask falls to the level of the limit price.For example suppose the dealer's bid and ask are 20 to 20,and suppose the dealer holds a limit order to buy at 20 1/8.Incoming sell market orders would trade at 20,the dealer bid,not at 20 1/8,the limit order.The limit order to buy would trade only when the ask price fell to 20 1/8.Nasdaq rules have been modified to require that the dealer trade customer limit orders at the same or better price before trading for his own account (Manning Rule),and to require the display of limit orders(the SEC's order handling rules of 1997) Orders may also be distinguished by size.Small and medium orders usually follow the standard process for executing trades.Large orders,on the other hand,often require special handling.Large orders may be "worked"by a broker over the course of the day.The broker uses discretion when and how to trade segme nts of the order.Large orders may be traded in blocks.Block trades are often pre-negotiated "upstairs"by a broker who has identified both sides of the trade.The trade is brought to a trading floor, as required by exchange rules and executed at the pre-arranged prices.The exchange specifies the rules for executing resting limit orders. I.C.Types of traders Traders in markets may be classified in a variety of ways. Active versus passive Some traders are active (and normally employ market orders),while others are passive(and normally employ limit orders).Active traders demand immediacy and push prices in the direction of their trading,whereas passive traders supply immediacy and stabilize prices.Dealers are typically passive traders.Passive traders tend to earn profits from active traders. Liquidity versus informed Liquidity traders trade to smooth consumption or to adjust the risk-return profiles of their portfolios.They buy stocks if they have excess cash or have become more risk tolerant,and they sell stocks if the need cash or have become less risk tolerant.Informed 5

5 In a pure dealer market, limit orders are not displayed but are held by the dealer to whom they are sent, and market orders trade at the dealers bid or ask, not with the limit orders. In some cases, such as Nasdaq before the reforms of the mid 1990s, a limit order to buy only executes if the dealer’s ask falls to the level of the limit price. For example suppose the dealer’s bid and ask are 20 to 20 ¼ , and suppose the dealer holds a limit order to buy at 20 1/8. Incoming sell market orders would trade at 20, the dealer bid, not at 20 1/8, the limit order. The limit order to buy would trade only when the ask price fell to 20 1/8. Nasdaq rules have been modified to require that the dealer trade customer limit orders at the same or better price before trading for his own account (Manning Rule), and to require the display of limit orders (the SEC’s order handling rules of 1997). Orders may also be distinguished by size. Small and medium orders usually follow the standard process for executing trades. Large orders, on the other hand, often require special handling. Large orders may be “worked” by a broker over the course of the day. The broker uses discretion when and how to trade segme nts of the order. Large orders may be traded in blocks. Block trades are often pre-negotiated “upstairs” by a broker who has identified both sides of the trade. The trade is brought to a trading floor, as required by exchange rules and executed at the pre-arranged prices. The exchange specifies the rules for executing resting limit orders. I.C. Types of traders Traders in markets may be classified in a variety of ways. Active versus passive Some traders are active (and normally employ market orders), while others are passive (and normally employ limit orders). Active traders demand immediacy and push prices in the direction of their trading, whereas passive traders supply immediacy and stabilize prices. Dealers are typically passive traders. Passive traders tend to earn profits from active traders. Liquidity versus informed Liquidity traders trade to smooth consumption or to adjust the risk-return profiles of their portfolios. They buy stocks if they have excess cash or have become more risk tolerant, and they sell stocks if the need cash or have become less risk tolerant. Informed

traders trade on private information about an asset's value.Liquidity traders tend to trade portfolios,whereas informed traders tend to trade the specific asset in which they have private information.Liquidity traders lose if they trade with informed traders. Consequently they seek to identify the counterparty.Informed traders,on the other hand, seek to hide their identity.Many models of market microstructure involve the interaction of informed and liquidity traders Individual versus institutional Institutional investors-pension funds,mutual funds,foundations and endowments-are the dominant actors in stock and bond markets.They hold and manage the majority of assets and account for the bulk of share volume.They tend to trade in larger quantities and face special problems in minimizing trading costs and in benefiting from any private information.Individual investors trade in smaller amounts and account for the bulk of trades.The structure of markets must accommodate these very different players.Institutions may wish to cross a block of 100,000 shares into a market where the typical trade is for 3,000 shares.Markets must develop efficient ways to handle the large flow of relatively small orders while at the same time accommodating the needs of large investors to negotiate large transactions Public versus professional Public traders trade by placing an order with a broker.Professional traders trade for their own accounts as market makers or floor traders and in that process provide liquidity.Computers and high speed communications technology have changed the relative position of public and professional traders.Public traders can often trade as quickly from upstairs terminals(supplied to them by brokers)as professional traders can trade from their terminals located in offices or on an exchange floor.Regulators have drawn a distinction between professional and public traders and have imposed obligations on professional traders.Market makers have an affirmative obligation to maintain fair and orderly markets,and they are obligated to post firm quotes.However,as the distinction between a day trader trading from an upstairs terminal and a floor trader becomes less clear,the appropriate regulatory policy becomes more difficult. I.D.Rules of precedence 6

6 traders trade on private information about an asset’s value. Liquidity traders tend to trade portfolios, whereas informed traders tend to trade the specific asset in which they have private information. Liquidity traders lose if they trade with informed traders. Consequently they seek to identify the counterparty. Informed traders, on the other hand, seek to hide their identity. Many models of market microstructure involve the interaction of informed and liquidity traders. Individual versus institutional Institutional investors – pension funds, mutual funds, foundations and endowments – are the dominant actors in stock and bond markets. They hold and manage the majority of assets and account for the bulk of share volume. They tend to trade in larger quantities and face special problems in minimizing trading costs and in benefiting from any private information. Individual investors trade in smaller amounts and account for the bulk of trades. The structure of markets must accommodate these very different players. Institutions may wish to cross a block of 100,000 shares into a market where the typical trade is for 3,000 shares. Markets must develop efficient ways to handle the large flow of relatively small orders while at the same time accommodating the needs of large investors to negotiate large transactions. Public versus professional Public traders trade by placing an order with a broker. Professional traders trade for their own accounts as market makers or floor traders and in that process provide liquidity. Computers and high speed communications technology have changed the relative position of public and professional traders. Public traders can often trade as quickly from upstairs terminals (supplied to them by brokers) as professional traders can trade from their terminals located in offices or on an exchange floor. Regulators have drawn a distinction between professional and public traders and have imposed obligations on professional traders. Market makers have an affirmative obligation to maintain fair and orderly markets, and they are obligated to post firm quotes. However, as the distinction between a day trader trading from an upstairs terminal and a floor trader becomes less clear, the appropriate regulatory policy becomes more difficult. I.D. Rules of precedence

Markets specify the order in which resting limit orders and/or dealer quotes execute against incoming market orders.A typical rule is to give first priority to orders with the best price and secondary priority to the order posted first at a given price.Most markets adhere to price priority,but many modify secondary priority rules to accommodate large transactions.Suppose there are two resting orders at a bid price of $40.Order one is for 2,000 shares and has time priority over order two,which is for 10,000 shares.A market may choose to allow an incoming market order for 10,000 shares to trade with resting order two rather than break up the order into multiple trades. Even price priority is sometimes difficult to maintain,particularly when different markets are involved.Suppose the seller of the 10,000 shares can only find a buyer for the entire amount at $39.90,and trades at that price.Such a trade would "trade-through"the $40 price of order one for 2,000 shares.Within a given market,such trade-throughs are normally prohibited-the resting limit order at $40 must trade before the trade at $39.90. In a dealer market,like Nasdaq,where each dealer can be viewed as a separate market,a dealer may not trade through the price of any limit order he holds,but he may trade through the price of a limit order held by another dealer.When there are many competing markets each with its own rules of precedence,there is no requirement that rules of precedence apply across markets.Price priority will tend to rule because market orders will seek out the best price,but time priority at each price need not be satisfied across markets. The working of rules of precedence is closely tied to the tick size,the minimum allowable price variation.As Harris(1991)first pointed out,time priority is meaningless if the tick size is very small.Suppose an investor places a limit order to buy 1000 shares at $40.If the tick size is $0.01,a dealer or another trader can step in front with a bid of 40.01-a total cost of only $10.On the other hand,the limit order faces the danger of being "picked off"should new information warrant a lower price.If the tick size were $0.10,the cost of stepping in front of the investor's limit order would be greater($100). The investor trades off the price of buying immediately at the current ask price,say $40.20,against giving up immediacy in the hope of getting a better price with the limit order at $40.By placing a limit order the investor supplies liquidity to the market.The 7

7 Markets specify the order in which resting limit orders and/or dealer quotes execute against incoming market orders. A typical rule is to give first priority to orders with the best price and secondary priority to the order posted first at a given price. Most markets adhere to price priority, but many modify secondary priority rules to accommodate large transactions. Suppose there are two resting orders at a bid price of $40. Order one is for 2,000 shares and has time priority over order two, which is for 10,000 shares. A market may choose to allow an incoming market order for 10,000 shares to trade with resting order two rather than break up the order into multiple trades. Even price priority is sometimes difficult to maintain, particularly when different markets are involved. Suppose the seller of the 10,000 shares can only find a buyer for the entire amount at $39.90, and trades at that price. Such a trade would “trade-through” the $40 price of order one for 2,000 shares. Within a given market, such trade-throughs are normally prohibited – the resting limit order at $40 must trade before the trade at $39.90. In a dealer market, like Nasdaq, where each dealer can be viewed as a separate market, a dealer may not trade through the price of any limit order he holds, but he may trade through the price of a limit order held by another dealer. When there are many competing markets each with its own rules of precedence, there is no requirement that rules of precedence apply across markets. Price priority will tend to rule because market orders will seek out the best price, but time priority at each price need not be satisfied across markets. The working of rules of precedence is closely tied to the tick size, the minimum allowable price variation. As Harris (1991) first pointed out, time priority is meaningless if the tick size is very small. Suppose an investor places a limit order to buy 1000 shares at $40. If the tick size is $0.01, a dealer or another trader can step in front with a bid of 40.01 – a total cost of only $10. On the other hand, the limit order faces the danger of being “picked off” should new information warrant a lower price. If the tick size were $0.10, the cost of stepping in front of the investor’s limit order would be greater ($100). The investor trades off the price of buying immediately at the current ask price, say $40.20, against giving up immediacy in the hope of getting a better price with the limit order at $40. By placing a limit order the investor supplies liquidity to the market. The

smaller tick size reduces the incentive to place limit orders and hence adversely affects liquidity. Price matching and payment for order flow are other features of today's markets related to rules of precedence.Price matching occurs when market makers in a satellite market promise to match the best price in the central market for orders sent to them rather than to the central market.The retail broker usually decides which market maker receives the order flow.Not only is the broker not charged a fee,he typically receives a payment (of one to two cents a share)from the market maker.Price matching and payment for order flow are usually bilateral arrangements between a market making firm and a retail brokerage firm.Price matching violates time priority:When orders are sent to a price matching dealer,they are not sent to the market that first posted the best price. Consequently the incentive to post limit orders is reduced because the limit order may be stranded.Similarly,the incentive of dealers to post good quotes is eliminated if price matching is pervasive:A dealer who quotes a better price is unable to attract additional orders because orders are preferenced to other dealers who match the price. I.E.The trading process The elements of the trading process may be divided into four components- information,order routing,execution,and clearing.First,a market provides information about past prices and current quotes.Earlier in its history,the NYSE jealously guarded ownership of its prices,making data available only to its members or licensed recipients. But today transaction prices and quotes are disseminated in real-time over a consolidated trade system(CTS)and a consolidated quote system(CQS).Each exchange participating in these systems receives tape revenue for the prices and quotes it disseminates.The real- time dissemination of these prices makes all markets more transparent and allows investors to determine which markets have the best prices,thereby enhancing competition. Second,a mechanism for routing orders is required.Today brokers take orders and route them to an exchange or other market center.For example,the bulk of orders sent to the NYSE are sent via DOT(Designated Turnaround System),an electronic system that sends an order directly to the specialist.Retail brokers establish procedures

8 smaller tick size reduces the incentive to place limit orders and hence adversely affects liquidity. Price matching and payment for order flow are other features of today’s markets related to rules of precedence. Price matching occurs when market makers in a satellite market promise to match the best price in the central market for orders sent to them rather than to the central market. The retail broker usually decides which market maker receives the order flow. Not only is the broker not charged a fee, he typically receives a payment (of one to two cents a share) from the market maker. Price matching and payment for order flow are usually bilateral arrangements between a market making firm and a retail brokerage firm. Price matching violates time priority: When orders are sent to a price matching dealer, they are not sent to the market that first posted the best price. Consequently the incentive to post limit orders is reduced because the limit order may be stranded. Similarly, the incentive of dealers to post good quotes is eliminated if price matching is pervasive: A dealer who quotes a better price is unable to attract additional orders because orders are preferenced to other dealers who match the price. I.E. The trading process The elements of the trading process may be divided into four components – information, order routing, execution, and clearing. First, a market provides information about past prices and current quotes. Earlier in its history, the NYSE jealously guarded ownership of its prices, making data available only to its members or licensed recipients. But today transaction prices and quotes are disseminated in real-time over a consolidated trade system (CTS) and a consolidated quote system (CQS). Each exchange participating in these systems receives tape revenue for the prices and quotes it disseminates. The realtime dissemination of these prices makes all markets more transparent and allows investors to determine which markets have the best prices, thereby enhancing competition. Second, a mechanism for routing orders is required. Today brokers take orders and route them to an exchange or other market center. For example, the bulk of orders sent to the NYSE are sent via DOT (Designated Turnaround System), an electronic system that sends an order directly to the specialist. Retail brokers establish procedures

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