US Court of Appeals, Meinhard v. Salmon
“ I assume that where parties engage in a joint enterprise each owes to the other the duty of the utmost good faith in all that relates to their common venture. Within its scope they stand in a fiduciary relationship. I assume prima facie that even as between joint adventurers one may not secretly obtain a renewal of the lease of property actually used in the joint adventure where the possibility of renewal is expressly or impliedly involved in the enterprise. I assume also that Mr. Meinhard had an equitable interest in the Bristol Hotel lease. ”
