First this, from a blogpost by David Firestone:
On the most basic level, the American Recovery and Reinvestment Act is responsible for saving and creating 2.5 million jobs. The majority of economists agree that it helped the economy grow by as much as 3.8 percent, and kept the unemployment rate from reaching 12 percent.
The stimulus is the reason, in fact, that most Americans are better off than they were four years ago, when the economy was in serious danger of shutting down.
But the stimulus did far more than stimulate: it protected the most vulnerable from the recession’s heavy winds. Of the act’s $840 billion final cost, $1.5 billion went to rent subsidies and emergency housing that kept 1.2 million people under roofs. (That’s why the recession didn’t produce rampant homelessness.) It increased spending on food stamps, unemployment benefits and Medicaid, keeping at least seven million Americans from falling below the poverty line.
The book is The New New Deal: The Hidden Story of Change in the Obama Era, by Michael Grunwald.