Margaret Thatcher used to say that “There is no alternative” to whatever policy she believed in. But there is always an alternative to banging your head against a brick wall — you can stop banging your head against a brick wall. The G20 Finance Ministers’ meeting in Moscow last weekend may have marked such a moment of revelation, when governments around the world gave up on fiscal and financial austerity, and recognized that growth based on consumption, borrowing and rising house prices is better than no growth at all.