Wow, talk about an ignorant comment.  So first of all, buying on an IPO means you are more often than not, buying from private equity funds ownership interest and not necessarily injecting new capital.  And by suggesting that owning a stock means the "investing" is done, you obviously have very little understanding how capital is used and formed.  Each year a portion of the earnings that is available for equity holders, the free cash flow to equity, can either be returned to shareholders as a dividend or reinvested if they can earn an acceptable return.  Plus the price of a company's paper is very important as the company can use it to further invest by selling equity.  Should that be treated different?

The sad part is this is the kind of ignorance that liberals prey on.  Sad.