[1] The corporate opportunity doctrine is one application of the fiduciary duty of loyalty.
[6] In the leading English law case of Regal (Hastings) Ltd v Gulliver [1942] UKHL 1 it was held that "The rule of equity which insists on those who by use of a fiduciary position make a profit, being liable to account for that profit, in no way depends on fraud, or absence of bona fides ... or whether the plaintiff has in fact been damaged or benefited by his action."
[7] The Delaware Court of Chancery has stated, "An opportunity is within a corporation's line of business .
if it is an activity as to which the corporation has fundamental knowledge, practical experience and ability to pursue.
[9] Investing was in a line of business of eBay because eBay "consistently invested a portion of its cash on hand in marketable securities.