noun
free rider
Economic and social term for someone who benefits from a collective good without contributing; often used in discussions of public goods, unions, or group projects.
公共財のフリーライダー問題は経済学の重要なテーマだ。
The free-rider problem of public goods is an important topic in economics.
彼はいつも会費を
He is always a free rider who never pays the membership fee.