万里孤云,清游渐远,故人何处?寒窗梦里,犹记经行旧时路。连昌约略无多柳,第一是难听夜雨。漫惊回凄悄,相看烛影,拥衾无语。吾谋适不用,勿谓知音稀。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. |