ChapterTwoBehavioral economy explains how and why consumer choiceCan apply behavioral economy method to explain how and why customer individual will decide every decisional choice? It is one fun psychological and mocro economic question to research every consumer individual behavior. Why does he/she choose to buy the product or consume the service? Does he/she compare the economic benefit or opportunity cost before he/she choose to buy the product or consume the service? What factors persuade or attract the consumer to make the final consumption decision. All these questions which seem product manufacturers or product sellers or service providers can attempt to apply behavioral economy theory to predict consumer behaviors more easily in order to avoid the loss chance to choose to buy their products or consume their service more easily in every consumer individual choice decision making process.Traditional economy can be predominted by psychology, but it can also include elements of philosophy, sociology nd even mathematics or econometrics. When any product manufacturers or sellers or service providers expect to predict consumer market how will change to influence consumer individual consumption effort. Analysis is necessary, it is made possible a better understanding of the human brain and of the fundmentals on which it builds decision-making. However, they also need to make any hypotheses of consumption environment to attempt to find what factors will influence future individual customer behavioral changes to make decision making whether how any why he/she chooses to buy the product or consume the service. So, the research methodology was concentrate on quality method more than quantity method when any product manufacturer or service provider expects to predict future consumer behavioral how and why changes more easily. The research processing includes data collected from the global business similar product seller market. The data can concern: How and why the environmental factors had influenced many consumers make emotional reponses of individuals in economical decision making to choose the purchase any similar brand product consumers' shopping experiences will help the present product manufacturers to predict whether how and why what factors will influence the similar product consumers to choose to buy its products in future consumption environment more easily.It is any product manufacturers or sellers or service providers whose final aim to achieve any behavioral economic research concerns consumer behavioral researchs. According to standard economic model consumers are making decisions in the comprehensive economic or consumption environment, they know their preferences, their choices are always rational more than not rational. So, rational mind will influence their consumption choice behaviors to make the most reasonable consumption decision when they feel or believe their choice to buy the product or consume the service which is the most reasonable . They will compare different brands of products values to evaluate whether which brands can bring the largest economic benefit to avoid the loss to use after they choose to buy the product to use.