When John Maynard Keynes wrote his essay – Economic Possibilities for Our Grandchildren – which was published in 1930 he considered that workers would be able to work just 15 hours a week because of the likely technological shifts over the 100 years from the date of his publication. He was right about the productivity gains that have been created but wrong about the benefits workers would gain from them. He thought the productivity would be more evenly shared out. He underestimated the capacity of capital to extract the gains for profits and capture the state to ensure it used its legislative and regulative capacity to suppress wages growth. Mainstream economists have aided and abetted the rising inequality and the reconfiguration of the state as a agent for capital. This bears on how we understand some of the apparent shifts in views by mainstream economists about fiscal deficits and central bank debt purchases. Yesterday, it was all bad. Today, all good. History warns us to be cautious in how we appraise these shifts. There is something to be said for consistency.