限界 げんかい効用 こうよう均等 きんとう法則 ほうそくでした
genka ikō yōkintōno hōsokudeshita

Noun
Desu Copula

The polite past form of 限界効用均等の法則

1. The law of diminishing marginal utility was. ; ; It was the law of diminishing marginal utility.

Past/Perfective
Polite