Lynne Kiesling
Seriously, this is why I love Joseph Schumpeter — from The Theory of Economic Development, p. 64, fn 1:
“… what we are about to consider is that kind of change arising from within the system which so displaces its equilibrium point that the new one cannot be reached from the old one by infinitesimal steps. Add successively as many mail coaches as you please, you will never get a railway thereby.”