In the world of traditional economics, it shouldn't matter whether you use an opt-in or opt-out system. So long as the costs of registering as a donor or a nondonor are low, the results should be similar. But many findings of behavioral economics show that tiny disparities in such rules can make a big difference.

Many Americans say they want to be organ donors, but they just don't get around to acting on their intentions. Helping these potential good Samaritans overcome their inertia could prolong thousands of lives a year.

There can be legal conflicts over whether registering intent is enough to qualify you as an organ donor or whether a doctor must still ask your family's permission.

Richard Thaler Quotes