Behavioral economic is in understanding how individuals do or do not smooth consumption over time. Smoothing consumption is a standard economic models. It suggests that individuals should borrow or save in order to consume a similar amount throughout one's lifetime. For example, a teacher who is paid a salary 12 months a year, who should not spend all whose salary within one year. Rather, the teacher should smooth whose consumption over the 12 month period. How to allocate to spend paychecks, food and social security payments which concerns the teacher decide to spend whose salary efficiently. Hence, who needs to plan how he shall spend whose one year salary to be reasonable use in the future.Public economic is to understand how people respond to taxation and social benefit programs. This has been an area that has seen an explosion of behavioral work in recent year. i.e. how taxpayers can experience over-withholding and receive tax refunds from tax department. Policymakers and insurers are also increasingly turning to psychology for approaches to improve health behavior. Traditionally health-policy focused largely on information provision, assuming that as long as individuals were well informed, their decisions would maximize their health choices. Influential work on the effects of smoking taxes, however, well being of smokers appears to increase with higher taxes to influence health behaviours are not completely rational.Behavioral economic has also had a small impact on the study of criminal behaviour. For example, individuals are not less likely to commit a crime when who are 18 age and the pubishment of doing so increases dramatically. However, some economists explain the motivations people have for giving to charity and who understand the psychological motivations for charitable giving. So, it seems that charity award giving has probable to reduce 18 age people who choose to do crime behaviour easily because who feel who have effort to assist charity in their life time.Industrial organization economists study why firms exist and how which function and compete with each other. Insights and psychology and behavioral economics have made a significant contribution to develop that model the interactions of profit maximizing firms with their customers. In fact, firms often need to evaluate whether their products if prices are needed to set what of price of level is the most reasonable and attractive to customers to choose to buy their products. For example, individuals choose cell phone plans with fixed minute allotments and steep charges for going over the minute limits, but frequently exceed their plan limits. This behavior is the best explained by a model in which people overestimate the precision of their demand forecasts. So, cell phone firms need to research how cell phone plans with fixed minute allotments ans steep charges of cell phone call fee charge plan is the most acceptance method to cell phone clients generally. However, cell phone call charge plan and various cell phone product features and the way cell phone clients allocate their limited attention affects cell phone products markets which are external important factors can influence any cell phone clients why who will choose to use the cell phone call plan because any cell phone will be very large durable product to any cell phone consumer after who choose to buy the cell phone product. Hence, who will not often choose to use the old cell phone firm call charge plan if who feel it provides the excellent cell phone call service and reasonable phone call plan to use to compare other cell phone call plans in the cell phone call market. Hence, the cell phone call firm needs to research why consumers need to choose to use which cell phone call plan among of other cell phone call plans in the cell phone call market.