I'm not sure where you are getting your numbers, but the construction industry has long had notoriously slow productivity growth. In the US, labor productivity

I'm not sure where you are getting your numbers, but the construction industry has long had notoriously slow productivity growth. In the US, labor productivity in construction has stayed essentially flat since 1947, and decreased since its peak in 1968. "Reinventing construction: A route to higher productivity", McKinsey Global Institute (2017) (pdf, see page 23): https://www.mckinsey.com/~/media/McKinsey/Industries/Capital%20Projects%20and%20Infrastructure/Our%20Insights/Reinventing%20construction%20through%20a%20productivity%20revolution/MGI-Reinventing-construction-A-route-to-higher-productivity-Full-report.ashx https://www.mckinsey.com/~/media/McKinsey/Industries/Capital...