[deltaseventhree]

Long sigted. The investment starts from scratch. Why not invest in some places cheaper? Why not invest in a place that has better expertise?

Overall the long term vision is to wrestle some control away from China. That is the long term bet the US and tsmc are ultimately making and what's driving the decision. But economically this is a bad bet.

[mixmastamyk]

The why is obvious. Not having vital infra solely in the hands of a potential enemy is strategy 101.

Economics are but one factor of many.