Trump tariffs: This is the biggest change to global trade in 100 years

The impact of these tariffs on the world economy will be huge. They can be measured by the lines on a chart of US tariff revenue jumping to levels not seen in a century - beyond those seen during the high protectionism of the 1930s.Or in the overnight stock market falls, especially in Asia.But the true measure of these changes will be significant changes to long-standing global avenues of trade.At its heart this…