“We have listened to the wisdom of an old Russian maxim, doveryai, no proveryai—trust, but verify.” President Ronald Reagan at the signing of the INF Treaty, December 8, 1987.

In July 2010, central bank governors and supervisors from the 28 jurisdictions that make up the Basel Committee membership were hammering out the agreement on new capital and liquidity requirements now known as Basel III. There was a large sticking point. Some members were standing firm on their desire to have higher capital requirements. Others felt that this would make credit more expensive and less plentiful.

Had agreement not been reached, those insisting on more capital might have said: “Go ahead, be permissive. But if you let your banks operate with low levels of capital, we’ll restrict our banks from doing business with them.” Fortunately, it didn’t come to that....