Now it is unambiguously clear that trickle-down economics does not work. But what does that mean? That means we have to structure our economic policies to make sure that we have shared prosperity. And you don't do that by giving a tax cut to the big winners and raising taxes on those who have not done very well. Your economic policy has to respond to the way our economic system has been working.

The problem with NAFTA was with what we wanted. And there, the agenda had been set by our corporations. So what is true is that workers in the United States and workers in the developing countries were often disadvantaged. They were worse off. The big winners were our corporations.

The crisis was 2008, in 2015 - almost eight years later and the gap between where we would have been and where we are is huge and not closing. The implied unemployment rate is very high, labour force participation is very low, and the increase in wages in the second quarter was the lowest in 25 years. Before this turmoil, the U.S. economy was in better shape than Europe or Canada, but not strong.

People at the top spend less money than those at the bottom so when you have redistribution toward the top, aggregate demand goes down. Unless you intervene, you're going to have a weak economy unless something else happens. That something else could be a bubble. The United States tried a tech bubble and a housing bubble, but those were not sustainable answers. So I view inequality as a fundamental part of our macroeconomic weakness.

What you measure affects what you do. If you don't measure the right thing, you don't do the right thing.

America has had to turn to foreigners to finance its debt - not surprising since household saving in the last years has plummeted to zero. China is one of the largest holders of American debt.

Most poor people earn more than minimum wage when they are working; their problem is not low wages. The problem comes when they are not working.