How can you tell if society is moving beyond scarcity? A guide to five mileposts to pass on the way. — Poets, priests and politicians have periodically predicted the imminence of a post-scarcity society, one in which everyone has enough to meet their basic material needs. The land of milk and honey. Star Trek’s food-replicator-filled worlds. Marxist communism. Some, like leaders of the Soviet Union and American utopian communities, have claimed…