If the financial debacles of the past decade—the enormous bubbles, the credit collapse and its trillion-dollar consequences—have taught us anything about the American economy, it is that capitalists have done a remarkably poor job of safeguarding the future of capitalism. Our system became so dominated by finance, insurance, and real estate, and by the complex derivative securities these industries engendered, that the most eminent financiers (and their unsleeping computers) were unable to protect us from economic shocks. For a number of years, farsighted commentators—including in this magazine—warned of the looming credit collapse, and yet the masters of our economy took no action until the crisis was already upon us. Now we must not only repair our tenuous financial system but shore it up to withstand two great, gathering storms: dwindling energy supplies and accelerating climate change. To this end, Harper’s Magazine asked a group of leading economic thinkers to offer sweeping but concrete proposals for the rescue of capitalism, and capitalists, from doom.