We live in an age of anxiety and crisis. And there is a long tradition of thought that liberal elites have drawn on during such moments to rescue civilization as they know it from collapse: what we would call Keynesianism today, but which Geoff Mann argues dates back to the French Revolution, centuries before the birth of the economist John Maynard Keynes. Mann discusses the complicated entanglement of the Keynesian interventionist state and the left, as well as why we’re seeing the revival of Keynesianism in the Green New Deal.