预期(Expectation)在现代经济理论发展和经济政策制定中发挥着重要作用。关于预期对经济主体行为影响的研究使其研究者获取了诺贝尔经济学奖，而各国政府对预期和通货膨胀关系的理解使宏观政策的运用更加自如。同样，对于预期和税制改革关系的研究也得到了发展，从一个侧面完善 Expectation plays an important role in the development of modern economic theory and in the formulation of economic policies. Researches on the expected impact on economic actors make their researchers win the Nobel Prize for Economics, and the understanding of the government on the relationship between expectation and inflation makes macroeconomic policy more comfortable. Similarly, the study of the relationship between expected and tax reform has also been developed, refined from one side