A large number of workers with Zero Marginal Product can be a sign of an economy in transition -- that is, a sign that people are employed in positions where th

A large number of workers with Zero Marginal Product can be a sign of an economy in transition -- that is, a sign that people are employed in positions where they may have been productive in the past, but changes in the overall environment have rendered them obsolete. This does not mean they're incapable of doing valuable work. It just means they haven't yet finished the transition from whatever no-value-added position they were in to a value-added position.