From the Wikipedia article on Indirection --
A famous aphorism of David Wheeler goes: All problems in computer science can be solved by another level of indirection.... Kevlin Henney's corollary to this is, "...except for the problem of too many layers of indirection."
-- which cracked me up. And which leads to this observation:
All problems in economics can be solved by using more credit... except for the problem of excessive reliance on credit.