Keyhole surgery techniques allow surgeons to operate without making large incisions, minimizing the risk of complications and side effects. Economists often advocate a similar strategy when trying to fix a policy problem: target the problem as closely as possible rather than attempting something a little more drastic.

Tim Harford, The undercover economist: exposing why the rich are rich, the poor are poor—and why you can never buy a decent used car!, Oxford, 2006, p. 138