cost-effectiveness; price-performance ratio
Used in business, economics, and everyday contexts to evaluate whether the benefit justifies the cost.
This new system is highly cost-effective.
Let's decide on a plan considering the cost-effectiveness.
費用対効果 is a more common word order for 'cost-effectiveness', while 対費用効果 is a less frequent variant with the same meaning.
Compound of 対 (against, versus), 費用 (cost), and 効果 (effect). The exact derivation is uncertain, but it follows a pattern of technical compounds.