Nor is it a solved problem. You cannot point to any modern economy as an example of successfully avoiding this issue, since they all rely heavily on subsidy inj

Nor is it a solved problem. You cannot point to any modern economy as an example of successfully avoiding this issue, since they all rely heavily on subsidy injections to maintain the economy(and for other reasons). A more modern example would be British coal. While people have moved on decades later, local economies were devastated. It can take generations to recover, while many fall through the cracks.