Summary: ISM PMI down from 57.1% to 55.4% in April; below expectations; US manufacturing remains constrained, progress on labour shortages slowing; latest reading implies 3.7% 12-month US GDP growth rate in September. The Institute of Supply Management (ISM) manufacturing Purchasing Managers Index (PMI) reached a cyclical peak in September 2017. It then started a downtrend which ended in March 2020 with a contraction in US manufacturing which lasted until June...