I hear that argument a lot in the context of drugs -- you can't patent a natural remedy so there's no big corporation pushing for it's adoption. But concrete is

I hear that argument a lot in the context of drugs -- you can't patent a natural remedy so there's no big corporation pushing for it's adoption. But concrete is not like that. The reason it's so widely used is precisely because it's easy to use widely. I mean, 2m thick stone walls are surely great if space and energy constraints allow you to put them up ...