The Importance of Savings and Investment

A lot of people like to say that a country's current account is the result of its savings or investment decisions. But actually savings and investment changes because of these other, what you might call exogenous decisions or shocks,. Not because a country collectively up and decides to save more money. Right? So traditionally, there are three possibilities. I'll give the first two: saving as reflecting changes in thriftiness or all that stuff, prudence, et cetera. And then let's talk about some of the reasons why countries do this deliberately, when they do it deliberately, and not as an accident right?