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" ... Another way to think about the same point. The barriers to trade are the barriers to trade, as Krugman says, "effective protection." This is not just the tariff level, nor quotas. It's also how much mind-numbing paperwork has to be done to cross national borders? How long do goods remain trapped in customs? And most important here, how much does the transport cost? Lower any of these things and we've lowered the effective protection against trade. And the thing is about transport costs that they have plummeted. The containerisation that started in the late 1950s has brought down those effective trade barriers hugely. You can now move 32 tonnes of just about anything from anywhere to anywhere for under $5,000. This is, by the standards of these things historically, a radical change to trade transport costs being almost an irrelevance. ... "