noun
law of diminishing marginal product
Economic principle stating that adding more of one input while holding others constant eventually yields lower per-unit returns.
限界生産物逓減の法則は、ミクロ経済学の基本概念の一つだ。
The law of diminishing marginal product is one of the fundamental concepts of microeconomics.
Often used interchangeably, but 収穫逓減の法則 (law of diminishing returns) is broader, referring to overall output, while 限界生産物逓減の法則 focuses specifically on the marginal product of an input.
Compound of 限界 (limit/margin), 生産物 (product), 逓減 (gradual decrease), and 法則 (law). A direct translation of the English economic term.