(Ir)rational protectionism
Paul Mason points out that world trade (more precisely exports from the developed world) is down by 40% on an annualised basis. We can imagine rational reasons for people to trade less with each other - for example an increased desire for saving reduces the resources available to devote to the slightly risky activity of exchanging with distant parties. But what appears at first sight not to be rational is the distinction between local and foreign trade. Trade within the UK, for example, is certainly not down by 40%. Of course the idea of "trade" within a country is not a very well-defined concept - one could perhaps look at interstate trade in the US, but I assume that such data is not collected comprehensively. But if we generalise to the idea of economic exchange in general, then GDP is essentially the measure we are looking for. And GDP, of course, has not fallen by 40% or anywhere close. So why has international trade fallen so much more? There are several proximate reas...