为自己加油

Economic activities began with the caveman, who was economically selfsufficient. As the primitive population grew and developed, the principle of division of labor evolved. One person was more able to perform some activity than another, and therefore each person concentrated on what he did best.

经济活动是由穴居人开始的。他们在经济上自给自足。随着原始人口的增长和发展，劳动分工的原则逐渐产生演变。一个人比另一个人更有能力完成某一活动，因而每个人集中精力干他最能干的事。