Theory:
The 1950 - 1990 era was a period of excessive standard of living in North America that no government policy could have kept going.
After WW2 there was only one game in town, America. Everyone else was either war torn or still didn't adopt free markets. America produced everything and convinced everyone to give them their gold in exchange for USD, which we all know got rugged.
The IMF and World Bank hadn't started their resource exploitation through loans yet, so America got their resources from their friendly socialists to the north.
As more countries, especially China, started producing cheaper than USA, the pressure of billions of people finally coming online and adopting free markets put insane downward pressure on prices of manufactured goods. American companies would benefit from this arrangement tremendously, but not American workers.
So at a high level, that insane standard of living that only North America enjoyed during that period eventually got distributed across the world and lifted billions out of poverty at the expense of white picket fences in Suburbia that basically anyone could afford without any skill.
Of course the global economy has billions of variables and no single thing can explain anything, but I think this factor actually played a bigger role than inflation.
anyway that's crazy, catch the blue jays vs yankees game yesterday?
