Strictly economic? There are none.
At least a tiny bit plausible? The same sort of legislation that made renewable energy profitable in some countries. That is, huge taxes on earthbound industry and big subsidies for spacebound.
Strictly economic? There are none.
At least a tiny bit plausible? The same sort of legislation that made renewable energy profitable in some countries. That is, huge taxes on earthbound industry and big subsidies for spacebound.