There is some theoretical sweet spot for this, something above «free» which draws in a large number of readers while still generating worthwhile marginal profits. (4thletter.net)
Companies should benefit from scale — more sales should bring more marginal profits. (thecollegeinvestor.com)
Mr. Hanrahan, of IDEAcarbon, said that the credits could, at the very least, be sold at a low price to traders who see the possibility for marginal profit in a way similar to the market for junk bonds. (heatisonline.org)