As Harvard developmental psychologist Robert Kegan, who has studied Bridgewater, says, in most work places everyone is working two jobs. The first is whatever their actual job is; the second consists of managing others' impressions of them, especially by hiding weaknesses and inadequacies - which is an enormous waste of energy.

The economy is like a machine.

Almost everything is like a machine.

Ask yourself whether you have earned the right to have an opinion. Opinions are easy to produce, so bad ones abound. Knowing that you don't know something is nearly as valuable as knowing it. The worst situation is thinking you know something when you don't.

I'm sure Donald Trump will think that he has the truth, and some journalist is arguing that he has truth, and somebody else is arguing that they have the truth. And in fact it's even worse than that because they're so hell bent on their arguments that they will distort the truth consciously. They'll manipulate the facts to support their arguments because they're so hung up in the fight. That's where the problem is, so we argue all the time.

I believe that one of the best ways of getting at truth is reflecting with others who have opposing views and who share your interest in finding the truth rather than being proven right

The most important thing you can have is a good strategic asset allocation mix. So, what the investor needs to do is have a balanced, structured portfolio – a portfolio that does well in different environments…. we don't know that we're going to win. We have to have diversified bets.