Consumption held huge proportion in our daily life, and, whether the discretion that reasonable consumption affects our life quality directly, the analytic research of behavior of the person that how is research expended through offset makes consumer effectiveness implementation the biggest thereby change, the derivation in the analysis of behavior of the person that expend from offset then gives demand curve. And analyse the effect with the balanced person that the price and income change offset are expended further. Study sth in order to apply it, so, the most crucial is, will combine the life to discuss actually even, if where,the agile in applying economics relevant theory in the life makes the consumption of reasonable reason, and risk of the avoid in if where,living.
Be in to analyse consumer lots and lots of the kind that different consumption has choosing between possibility, economist put forward " effectiveness " this concept. Effectiveness is consumer satisfies degree from what what when consuming some kind of commodity, get. Because the subject in this concept is to have two actually, consumer and some kind of commodity, see not hard from which so, actually effectiveness is to depend on not just the commodity of a consumption, depend on likewise consumer. The person that accordingly offset of a kind of commodity is expended is used whether effectively or the size of effectiveness, depend on not only commodity and the ability that serve to whether have the desire of contented consumption, that is to say, whether is that commodity the satisfaction that consumer admires in the heart, still depend on whether does consumer have the desire that consume this commodity or serves, that is to say, whether does the heart of consumer want, and the ego that consumer satisfies degree to its is experienced. So, can know from which, effectiveness matters with consumer greatly, because the desire of consumptive state of mind is subjective, it is to depend on of consumer, and commodity is after make choice of, its quality and form do not produce change mostly, the factor that affects effectiveness so is for the most part on consumer body. For example: A same ice-cream, what consumer eats today is very glad very satisfactory, and did not like the following day, bought no longer. time of a day, did ice-cream taste produce tremendous change, either, the state of mind that is consumer likely very produced change, had other better choice, or because of body reason, again or weather reason, wait a moment etc, the factor that affects customer has a lot of. So, we reach, effectiveness is evaluation of a kind of of the ability that consumer satisfies him desire to commodity subjective psychology.
? Effectiveness can reflect the consumer behavior that gives us to discuss undertake below affirmatory condition, for example commodity price, consumer income is waited a moment a series of relevant element is to be assumed had known. However, in real economy life, a lot of consumer are undertaking behavior is to facing a lot of uncertainty choosing. Uncertainty is to show economic doer cannot know him well and truly in beforehand some kind of decision-making the following result, or, the consequence that the behavior of a kind of economy of economic doer may produce is more than a kind, the uncertainty that generates thereby. For example: Consumer goes buying the notebook computer of the some model of some brand, when leaving factory, appearing on the market detect through quality, can be quality detected result is not hundred qualification, is unqualified odds falls only very low, inaccuracy decides the consequence that the deed of this one economy that so this consumer buys notebook computer produces, a kind of consequence is, bought eligible notebook computer, another kind is, bought unqualified notebook computer. Such uncertainty is seen in the everywhere in real economy life. But if be,oneself know in consumer when all sorts of possible consequence that decision-making place produces some kind of action, when at the same time consumer still can know all sorts of possibility that happen as a result, the circumstance that can weigh this kind of uncertainty is a risk. For example, cast coin, in coin it is normal, and the environment of cast is normal circumstance falls, not only the outcome that can know pitch has two kinds only, look out perhaps is turned over to go up on openly face namely, the probability that still can know these two kinds of cases appear is each 50% , this is typical risk issue.
