国家经济是nation's economy还是national economy？

national economy
国家的经济应该用“国家”的形容词。
一般没有用sth's
一般都是sb's,用sth's一般用...of sth

不能一概而论，要根据需要。如：
China made several favorable policies for investment promotion that led to the boom of the nation’s economy in 1980s.

national economy
Of course.