Among the most viable of all economic delusions is the belief that machines on net balance create unemployment. Destroyed a thousand times, it has risen a thousand times out of its own ashes as hardy and vigorous as ever. Whenever there is long-continued mass unemployment, machines get the blame anew. This fallacy is still the basis of many labor union practices. The public tolerates these practices because it either believes at bottom that the unions are right, or is too confused to see just why they are wrong.