Economic viability is a function of cost today and profit tomorrow. Cost today depends on how much practice you had yesterday. It could be that projects in Euro

Economic viability is a function of cost today and profit tomorrow. Cost today depends on how much practice you had yesterday. It could be that projects in Europe and China are economically viable because the cost of civil engineering is lower than in the US since their engineers get plenty of practice and there's enough ongoing projects to justify capital investments in steel, cement, and equipment production that keep per unit costs of building materials low.