求助：...repurchases play a critical economic role in preventing mature companies from"overinvesting" and in allow investor to move their capital from mature sector with too much capital into high-growth industries with too little. but, in dividends, of course, accomplish the same function: so why are repurchase growth much more rapidly?

呵呵~~谢谢了，因为还没有学过，所以一点头绪都没有~~想快点完成，所以就来求助各位大人了~~主要就是想知道，可以通过哪些知识点来说明，谢谢~~