Strategic Management Journal, Vol 18, Summer 1997 Special Issue: Organizational and Competitive Interactions (Jul, 1997).15-30 Stable url: http://links.jstor.org/sici?sici=0143-2095%028199707902918%3c15%03ahmdimr%3e2.0.co%03b2-f trategic Management Journal is currently published by John Wiley Sons Your use of the jStOR archive indicates your

Recent studies of the relative size of corporate and industry effects have used ANOVA, Variance Components Analysis and Simultaneous Equations(Roquebert, Phillips and Westfall 1996 McGahan and Porter, 1997a; 1997b, Brush, Bromiley and Hendrikx, forthcoming ). This paper

Strategic Management Journal is currently published by John wiley sons Your use of the JSTOR archive indicates your acceptance of JSTOR's Terms and Conditions of Use, available at http://www.jstor.org/about/terms.htmlJstOr'sTermsandConditionsofUseprovidesinpartthatunlessyou have obtained prior permission, you may not download an entire issue of a journal or multiple copies of articles

Strategic Management Journal is currently published by John wiley sons Your use of the JSTOR archive indicates your acceptance of JSTOR's Terms and Conditions of Use, available at http://www.jstor.org/about/terms.htmlJstOr'sTermsandConditionsofUseprovidesinpartthatunlessyou have obtained prior permission, you may not download an entire issue of a journal or multiple copies of articles, and you may use content in the JSTOR archive only for your personal, non-commercial use

Two stimulating and innovative papers by Morrill were concerned with waves of spatial diffusion.(Morrill,[1, 2 )The purpose of the first was to propose some insights and interpretations which can be obtained by characteriz ive-like phend Morrill scopic and theoretical implications of such a conceptualization. He was concerned with both time and distance, and noted that in earlier conceptualizations more emphasis had been placed on de ecay re elated to time than on that related to distance. He therefore hypothesized that the number of innovations would de-

1. 3D 实体模型 (Solid model)
将使用者的设计概念以最真实的模型在计算机上呈现出来
随时计算出产品之体积、面积、质心、重量、惯性矩等 − 用以了解品之真实性 − 并补足传统面架构、线架构之不足

一、What is data Model and decisions什么是数据、模型与决策? 二、The Nature of management science管理科学的本质

数学模型(Mathematical Model)：对于一个特定的 对象，为了一个特定的目标，根据特有的内在规律，做出一 些必要的简化假设，运用适当的数学工具，得到一个数学结 构。 数学建模(Mathematical Modeling)：建立数学模型 的全过程，通常包括问题分析、模型建立、模型求解、结果 检验和应用

9.1 股票的需求与均衡价格 9.2 资本资产定价模型 9.3 资本资产定价模型的扩展形式 9.4 资本资产定价模型与流动性

Where Are We Doing in This Chapter? After modeling a consumer’s choice set and his preference (represented by utility functions), we now put them together and model how he/she makes optimal choice. In mathematical terms, this is a constrained maximization problem; In economics, this is a rational choice problem