⦁How to apply behavioral economy ( demand and supply) theory to predict marketing behavioral changes more accurate?Anyway, economists aim to develop models of human behavior and interactions in market in order to build useful models. Economists make simplifying assumptions to analyze why the market will be changed by consumer individual consumption behavior changing.Why do I assume consumers are as economic man ? In behavioral economy view point, how the perception of the economic man's behavior (including consumer choices) of economic models with the development of economics as a science. Economists explain the concept of economics as a science. It is the concept of consumer as an economic man, the essence and complexity of consumer behavior.The consumer and consumer purchasing behavior are an important area of interest of many scientific disciplines. The process of economic decision making as well as consumption choices are connected with wider human activities. The terms of both consumer individual attitudes and group social behavior will influence group social behavior will influence consumer individual final consumption decision in every consumption choice process. Thus, behavioral economy method can predict consumer behavioral changing, it can apply these sciences to research, includes sociology, psychology, anthropology, operational research, decision theory etc. different literature research aspects. I assume that businessmen can apply behavioral economy method to predict market changing behaviors successfully if they own behavioral economy knowledge.In this part, I shall concentrate on explain how the perception of the economic man's behavior ( including consumer choice) is applied to predict market behaviors. After explaining the concept of consumer as an economic man, the nature and complexity of consumer behavior are discussed to below different industries' marketing behavioral changing every case studies in US or UK countries.Why is consumer as an economic man? IN behavioral economy view point, the concept of answer is one of the fundamental concepts in economics because the consumer is the case market participant along with the producer. In general, lecturers define the consumer in various ways, but in behavioral economy view point, consumers mean economy man. Because who will compare cost and benefit to any product or service to decide to choose to buy the product or consume the service. Consumers are as "economic man", who will make own subjective preferences ( tastes), habits and traditions and existing objective constraints ( i.e. disposal income) market prices of products and services in order to satisfy whose needs to a maximum degree and in the most rational way.Thus, economic man means consumers need to make psychological mind to decide whether who either prefer to buy this product or another product or prefer to consume this service or another service more suitable. Thus, any markets or industries need have themselves benefits and consumers must need to evaluate whether the product or service has more benefits to compare other products or services in the consumption market to satisfy whose needs. It means that if the product or service has more benefits to compare other similar products or services. Then the product or service will persuade many consumers to choose to but the product or consume the service. Consequently, in first part, I shall indicate how to apply behavioral economy theory: economic man psychological method, benefits and costs benefits method, how to predict these US and UK enterprises marketing behavioral changing more accurate.In the second part, I shall apply micro employee behavioral economy concept to explain how to solve these US and UK inter-organizational management challenge.