夜来雨,赖倩得东风吹住。海棠正妖绕处,且留取。悄庭户,试细听莺啼燕语,分明共人愁绪,怕春去。佳树翠阴初转午。野老与人争席罢,海鸥何事更相疑。If productivity measures the efficiency of an economy, a measure of what an economic system produces is its gross national product (GNP), which is the current market value of all final goods and services that a nation produces within a particular period. |