収穫 しゅうかく逓減 ていげん法則 ほうそくであれば
shūkakuteigenno hōsokudeareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of 収穫逓減の法則

1. If the law of diminishing returns holds; If the law of diminishing returns were to hold

Ba Conditional