marginal utility standard

例句：

1. 1. Themarginal utility of education is a topic ofdebate among economists.
   教育边际效用是经济学家们争论的话题。
2. 2. The marginal utility oftime is often overlooked in economic decision-making.
   时间边际效用在经济决策中往往被忽视。
3. 3. The marginal utility of moneyis a complex issue that requires careful consideration.
   货币边际效用是一个复杂的问题，需要仔细考虑。