I love this one. Very innovative. Instead of promising dying cities that tinkering with the economy in just the right way will bring them back (Detroit, Buffalo), instead help people escape to more promising areas. This is definitely not a magical approach, relocation is a big deal, especially for the poor, and especially if it is relocation to an area where the relocatee lacks a support network. But it is definitely seems like one useful took in the toolkit.
In the wealthy suburbs, there is starting to be a shortage of entry-level service workers. My own teens and their peers are complaining how many hours are being pushed on them in their part-time jobs. What a tragic mis-match of demand and supply. So long as housing remains highly segregated by income, getting those in need of employment out to where the jobs are is a helpful compensation.
Human Capital Investments
Less innovative than the other two, but still valid. The whole gamut here, early childhood education, intervention, better schooling, better vocational training. Still a continuing struggle to make cost-efficient progress. If I had to pick two things, I think it would be early-childhood and vocational. If I had to pick one thing, it would be vocational.