How stocks prices around the world soared after Trump's election on November 8, 2016

People know how US stock prices soared immediately after President Trump was elected.  That is easy to explain because of the prospects of lower taxes and regulatory reform.  But more amazing is how stock prices around the world increased at the same time.  So many think that economics is a zero-sum game.  That was is good for the US is bad for the rest of the world.  And, surely, lower taxes in the US will increase investment in the US at the expense of what happens in other countries.  But fewer regulations and lower taxes in the US have apparently meant a more productive world economy. 

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