A planned economy ideally, even if that would hardly be immediately doable for most first world countries, as they lack any actual industrial capacity. If all useless jobs were to disappear overnight, most of the population would end up unemployed. In addition a lot of the "economy" of first world countries comes from abusive monetary relationships with third world countries, wish should obviously be ended as soon as possible.

Therefore a transitionary period would be needed, during which we would reindustrialize and develop some level of self-sufficiency. That last part might be less important for the US, as they're unlikely to get sanctioned by themselves.

Eventually a planned economy allows for production for use instead of for sale, providing to each according to their needs, and requiring work according to their abilities.