U
     Unemployment insurance 失業(yè)保險
     A government program that partially protects workers’ incomes when they become unemployed
     Unemployment rate 失業(yè)率
     The percentage of the labor force that is not employed
     Union 工會
     A worker association that bargains with employers over wages and working conditions
     Unit of account 計價單位
     The yardstick with which people post prices and record debts
     Utilitarianism 功利主義
     The political philosophy according to which the government should choose policies to maximize the total utility of everyone in society
     Utility 效用
     A measure of happiness or satisfaction
     union shops 工會化企業(yè)
     unionized firms in which all workers are required to join the union as a condition of employment
     utility possibilities curve效用可能性曲線
     a curve showing the maximum level of utility that one individual can attain, given the level of utility attained by others