Banning bonuses addresses the principal-agent problem in economics: the separation between an agent’s interests and those of the client, or principal, he is supposed to represent. The potency of my solution lies in the idea that people do not consciously wish to harm themselves; I feel much safer on a plane because the pilot, and not a drone, is at the controls. Similarly, cooks should taste their own cooking; engineers should stand under the bridges they have designed when the bridges are tested; the captain should be the last to leave the ship. The Romans even figured out how to deter cowardice that causes the death of others with the technique called decimation: If a legion lost a battle and there was suspicion of cowardice, 10 percent of the soldiers and commanders — usually chosen at random — were put to death.

No such pain faces bailed-out, bonus-taking bankers. The period from 2000 to 2008 saw a very large accumulation of hidden exposures in the financial system. And yet the year 2010 brought the largest bank compensation in history. It has become clear that merely “clawing back” past bonuses after the fact is not enough. Supervision, regulation and other forms of monitoring are necessary, but insufficient — consider that the Federal Reserve insisted, as late as 2007, that the rapidly escalating subprime mortgage crisis was likely to be “contained.”

What would banking look like if bonuses were eliminated? It would not be too different from what it was like when I was a bank intern in the 1980s, before the wave of deregulation that culminated in the 1999 repeal of the Glass-Steagall Act, the Depression-era law that had separated investment and commercial banking. Before then, bankers and lenders were boring “lifers.” Banking was bland and predictable; the chairman’s income was less than that of today’s junior trader. Investment banks, which paid bonuses and weren’t allowed to lend, were partnerships with skin in the game, not gamblers playing with other people’s money.

Hedge funds, which are loosely regulated, could take on some of the risks that banks would shed under my proposal. While we tend to hear about the successful ones, the great majority fail and their failures rarely make the front page. The principal-agent problem they have isn’t a problem for taxpayers: Typically their investors manage the governance of hedge funds by ensuring that the manager is hurt more than any of his investors in the event of a blowup.

I believe that “less is more” — simple heuristics are necessary for complex problems. So instead of thousands of pages of regulation, we should enforce a basic principle: Bonuses and bailouts should never mix.