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What are the implications of a corporate stock repurchase or share buyback program?
A board authorizes the repurchase of shares because they feel the stock in undervalued. The hope is that the stocks will rise either directly by their repurchase, or in the near term due to the realization that the company is in better shape then the market thought. Eventually those shares will be resold back into the market thus bring in more cash at a later date.  They will set limits on them maximum they will pay, they will also spread the repurchases out over a time period so they don't overwhelm the market.