You mean progressive rather than marginal, but yes. You can give people cash. You also have to kill a lot of restrictive zoning laws, because new housing can't

You mean progressive rather than marginal, but yes. You can give people cash. You also have to kill a lot of restrictive zoning laws, because new housing can't be built until they go away. You need to require new housing to pay for new infrastructure to support itself, and then you need to require old housing to pay for maintaining their infrastructure, too. You need to kill off local funding of education in favor of universal funding of education, because otherwise the poor kids get substandard schools and teachers. You need to fund public transit, and it needs to be aimed at getting people not just from their homes to work and back, but also to schools and stores and entertainment. Everything has to be automatically indexed to inflation, or else you get the same problem ten to twenty years later.