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 The potential for abuse of the corporate form is greatest when the corporation is owned by a single shareholder. The evaluation of corporate control claims cannot, however, disregard the fact that, no different from other stockholders, a parent corporation is expected -- indeed, required -- to exert some control over its subsidiary. Limited liability is the rule, not the exception. Anderson v. Abbott, 321 U.S. 349, 362, 88 L. Ed. 793, 64 S. Ct. 531 (1944). However, when a corporation is so controlled as to be the alter ego or mere instrumentality of its stockholder, the corporate form may be disregarded in ...