In a purely rational market, buying back shares doesn't boost stock price temporarily... it boosts it forever. You buy back shares and 'retire' them, thereby making everyone else's shares more valuable.
Now, if you're using debt to finance share buy backs, then yeah... it's a short term ploy. But most companies don't use buy backs this way.
Now, if you're using debt to finance share buy backs, then yeah... it's a short term ploy. But most companies don't use buy backs this way.