翻译失误
The law of diminishing marginal returns states that as the use of an input increases in equal increments (with other inputs fixed), a point will eventually be reached at which the resulting additions to output decrease.
Pindyck, R. S., Rubinfeld, D. L.,& Koh, W. T. H. (2006). Microeconomics (An Asian Perspective): Prentice Hall. Page 192.