Contract theory formalises the common sense that excess payments help prevent careless driving, which insurance companies cannot perfectly monitor.
契约理论正式确立了这种常识：自掏腰包的额外费用有助于阻止粗心驾驶，而后者是保险公司无法完美监测的。
2
It formalises economists' gut instincts about where the best analytical cuts lie. It is the starting point to which the theorist returns after every ingenious excursion.