free good
A free good is a good that is not scarce, and therefore is available without limits.Economics: An Introductory Analysis (1948) McGraw–Hill, ISBN 0-07-074741-5 ; Paul Samuelson with William D.
free good中文，free good的意思，free good翻译及用法
2026-10-17 13:15 浏览次数 28