I'd venture to say that health, safety,. and related regulation is the chilling effect on construction productivity here. OSHA didn't come around til the 70s bu

I'd venture to say that health, safety,. and related regulation is the chilling effect on construction productivity here. OSHA didn't come around til the 70s but plenty of implicitly required changes came about in the mid/late 40s, for numerous industries. On top of that, specific to construction industry, my theory is that WW2 hampered or reduced the available labor workforce while those in regulatory design positions were potentially exempt from the war and thus entrenched by the time 1947 came about. I could just be talking shit but I also would place a few bucks on being right.