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The relevant German policy is one of massive housebuilding. For decades they have had policies and programs to just build a ton of housing, because that depresses wage inflation pressure, which is important for their export economy. Building homes also happens to be a good idea for your citizens!

California, meanwhile, has recently hit an all-time low in home construction and the 2018 "boom" in housing starts was lower per-capita than any pre-1980 housing "bust".