the trucking industry. is this immoral to block exchanges associated with self driving auto industry to protect the free market from creating a large discontent populations like the ones that brought the socialist revolution a century ago? >> in terms of trade, well-established as a matter of economics that for a long time notwithstanding protectionist policies, it is good for both parties, the individuals engaging in the transaction. if you think about free trade in the most basic terms, two willing individuals, one part the money, the other part the goods, the reason i did so is both thought to be better off after the transaction than before. another way to think of it is protectionism makes sense, maybe we should protect ourselves from those marylanders up the road, portrayed barriers between maryland and dc to protect our local decent people. one reason the united states is such a prosperous country and has been for a long time is it is a large free trade zone. people in maryland trade with people from