The bond markets, in the words of US president Donald Trump, “were getting yippy” in April.US Treasury yields swung wildly after Trump levied steep tariffs on more than 100 countries on April 2, with the benchmark 10-year note lurching from a low of 3.87% on April 4 to 4.59% on April 11. And yet trading in CME’s interest rate markets, the largest in the world, remained astonishingly calm through April, with all major contracts trading at their minimum price increments – half of 1/32nd of a point, for the 1 ...