"a substantial cost of production" is often a barrier of entry exploited via a monopoly, whether in the form of superior patetended technology, exclusive produc

"a substantial cost of production" is often a barrier of entry exploited via a monopoly, whether in the form of superior patetended technology, exclusive production agreements, government subsidy, a distribution cartel, etc, etc. Are gas stations making profit off the gas or is that often a lost leader for high margin snack sales? I've heard that stations make nothing off gas sales. Copyright is a government supported distribution monopoly.