Post-war productivity boom (1948-1973)
US labor productivity grew at 2.8% a year for a quarter-century. Drivers included electrification of factories, the interstate highway system, and college access through the GI Bill. Real median wages roughly doubled.
Rising real wages built the post-war middle class and funded a large expansion of homeownership.
Productivity growth collapsed in 1973 and did not return to that pace for nearly three decades. Economists still argue about why.
Shows that productivity booms can run for decades, but also that they can end abruptly without obvious cause. Bloom's WFH thesis is essentially that a single technology shift, like electrification, can reset the trend.
