回报递减回报递减(英语:diminishing returns)又名收益递减、回报递减法则、收益递减法则(law of diminishing returns)、产量递减原则(principle of diminishing marginal productivity),边际回报递减、边际收益递减(diminishing marginal returns)、边际回报递减法则(边际回报递减定律)(law of diminishing marginal returns)以及边际产量递减法则(principle of