content: Well, by definition the closer everything moves to zero cost of production the closer humanity moves to a post scarcity society. Say with molecular 3D printing and massively cheap/powerful solar energy an individual only needs $1 per year to buy goods/services. Regardless of how hard or easy it would be to earn that dollar there would still be massive overproduction of products/services in relation to individual demand.  For example African nations used to employ many tailors to manufacture clothing but as basic clothing production cost has dropped 100 fold over the past century people have so much clothes they have trouble donating all of it and thousands of tons of free clothes are dumped on African shores each year rendering those tailor jobs as unnecessary novelties.