> why would a company ever do a stock buyback if changing the amount of issued stock didn't change the price?
Buy low/sell high maybe? They buy their stock when the price is low and they think it is undervalued so that they can sell it later when the price more accurately reflects the value or even better when the price is overvaluing their stock.
Buy low/sell high maybe? They buy their stock when the price is low and they think it is undervalued so that they can sell it later when the price more accurately reflects the value or even better when the price is overvaluing their stock.