Compulsion means force; there must be a policeman to see that the individual does not follow his own inclinations. But policemen must live. Since they do not produce a thing by which they can live, others must support them. Hence, the planners must have the means of getting at the production of the very people who are to be improved by the policeman. That means taxes, and the more taxes the greater the number of enforcement agents, and therefore the more comprehensive the plan. No plan can be bigger than its bureaucracy. The income tax is the ideal instrument for the planner.