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Why is stock dilution legal?
Stock dilution is legal because, in theory, the issuance of new shares shouldn't affect actual shareholder value. The other answers have explained fairly well why this is so. In practice, however, the issuance of new shares can destroy shareholder value. This normally happens when the issuing company:  In these cases, the issuance of more shares merely reduces each shareholder's stake in the company without building proportional shareholder value.