How to apply behavioral economic method to contribute to the stable basic income target consumer group's consumption prediction?What is basic income mean? A basic income is an income paid by a political community to all its members on an individual basis, without means test or work requirement. How to apply behavioral economic method to contribute to the basic income consumption prediction? I assume high income tax is charged to one high income tax payee, it will influence the high income tax payee individual consumption desires to be fallen, also extrinsic incentives will effort and intrinsic motivation and how the labor market change these variables under and big changes predicting, how income security changes social consumption preferences, e.g. how a big change affects the overall level of status -seeking behavior and this effect with income inequality to influence consumer individual consumption attitude or habit.How can behavioral economic methods predict consumer's consumption decision, in special the stable basic income consumer target group? In any consumption decisions are involving risk and uncertainty, the standard economic model usually assumes that decisions are based on final condition, regardless of the changes are caused by the results of a consumer's decision.An alterative mode of how consumers make decision and judgement under risk and uncertainty. This situation is often occurred in consumption market.In behavioral economic view point, it explains how consumer's consumption, however, which excludes the stable basic income earn factor can influence the stable basic income earn target consumer group decides to make final consumption decision to compare to the non-stable basic income earn target consumer group. The reasons include as below: (1)Consumers evaluate decisions over gains and losses with respect to some natural reference point, when they feel need to consume, which is assumed to be judgement about a sequence of outcomes are based on changes in wealth, rather than whether how much absolute basic income earn to influence whose consumption desires.(2)Thus, behavioral economic theory assumes the consumer is the low level of income group in society, but when who feels that he is still gains more than losses when who decides to buy the expensive product or consumes the expensive service. Then, the low level of income consumer who will accept to buy the expensive product or consume the service easily. Due to whose gains feeling is more than losses feeling, when who buys the product or consumes the service.(3) Behavioral economic theory also assumes the taxpayer will pay high income tax in this year. The, even the high income taxpayer can earn high basic income, but due to whom needs to pay high income tax in this year. Then, he/she will reduce much spending, even he/she reduces spending on cheap products or cheap service consumption for enjoyment. This is the taxpayer's economic decision to influence whose consumption behavior, due to the high income tax expenditure factor influences whose consumption behavior to change to be reduced spending expenditures in this year.