Introduction · Generally speaking, Keynesian economics多 e does not exclude the market condition (excess demand or supply) as a factor to determine price. Yet in addition to the market condition, the cost of production is also important in price determination. This seems to be contrast to the neo and new classical analysis according to which only the first is emphasized.%Introduction • Generally speaking, Keynesian economics does not exclude the market condition (excess demand or supply) as a factor to determine price. Yet in addition to the market condition, the cost of production is also important in price determination. This seems to be contrast to the Neo and New classical analysis according to which only the first is emphasized