The Economist explain
The first jump, in September 2007, followed dramatic interest-rate cuts by central banks, and the Bank of England’s bail-out of Northern Rock, a troubled mortgage lender. The October 2007 rise happened two days after the Bush Administration announced an initiative to coax banks to assist subprime borrowers. A year later, sales of the book rose after America’s Treasury said that it would use a big chunk of the $700 billion Troubled Asset Relief Programme to buy stakes in nine large banks. Debate over Mr Obama’s stimulus plan in January gave the book another lift. And sales leapt once again when the stimulus plan passed and Mr Obama announced a new mortgage-modification plan.
Their interpretation of this
Whenever governments intervene in the market, in short, readers rush to buy Rand’s book. Why? The reason is explained by the name of a recently formed group on Facebook, the world’s biggest social-networking site: “Read the news today? It’s like ‘Atlas Shrugged’ is happening in real life”. The group, and an expanding chorus of fretful bloggers, reckon that life is imitating art.