Added introductory text explaining the net effects of stock repurchase.

I added text to the intro to explain the objective effects of a stock repurchase on the company's balance sheet and on its two sets of stockholders at the time of the event.

The topics currently presented are about why the two opposing parties in a buyback (actual sellers and relative buyers) do what they do. Someone new to the topic this can't understood the "why" without first understanding what it is that they, collectively and separately do:

  • collectively disinvest in the company
  • transfer ownership from one set of current owners (who believe the company is a relatively good investment, compared to what they could do with cash) to another set (who think the company is a relatively bad investment, and would like to cash out)

For example, some experts express the belief in articles on the web that a stock buyback expresses management's belief that the company should invest in itself, because it thinks the company is a good investment. If I understand correctly, the opposite is true: a buyback is a disinvestment. Mark.camp (talk) 23:49, 12 December 2014 (UTC)

Reverted my edit, realized it was in error. Mark.camp (talk) 15:50, 13 December 2014 (UTC)