Economia em uma frase

Desse texto do escritor John Lanchester (acho que o Tyler Cowen que tinha indicado há alguns meses):

Richard Feynman was once asked what he would pass on if the whole edifice of modern scientific knowledge had been lost, and all he could give to posterity was a single sentence. What axiom would convey the maximum amount of scientific information in the fewest possible words? His candidate was ‘all things are made of atoms.’ In a similar spirit, if the whole ramshackle structure of contemporary macroeconomics vanished into thin air and the field had to be reconstructed from scratch, the sentence which packs as much of the discipline into the fewest possible words might be ‘governments are not households.’ The principles of running an economy are in many crucial respects different from those of keeping your own finances in order. 

E depois:

The fact that the people in charge of recommending huge cuts in public spending don’t, at this basic level, fully understand the economic effect of those cuts, is surprising only if you’re unfamiliar with just how little certainty there is in the world of macroeconomics. (An alternative single-sentence summary of the entire field would be ‘nobody knows anything.’) 

Sem pensar muito, acho que minha frase seria "pessoas respondem a incentivos". Qual seria a sua?