Justification for infidelity and dishonesty in all their manifestations lies in the marginal cost economics of just this once. - Clayton M. Christensen
Minority art, vernacular art, is marginal art. Only on the margins does growth occur. - Joanna Russ
Marginal gains is not about making small changes and hoping they fly. Rather, it is about breaking down a big problem into small parts in order to rigorously establish what works and what doesn't. - Matthew Syed