4.22
But, one may ask, when labour is abundant, how will a sufficient number of persons be found to hire it? Well, if anyone feels doubtful about that, let him comfort himself with the thought that many men in the business will hire the state slaves as additional hands, since they have abundance of capital, and that among those now working in the mines many are growing old. Moreover there are many others, both Athenians and foreigners, who have neither will nor strength to work with their own hands, but would be glad to to make a living by becoming managers.
4.23
Assume, however, that the total number of slaves to begin with is twelve hundred. By using the revenue derived from these the number might in all probability be raised to six thousand at the least in the course of five or six years. Further, if each man brings in a clear obol a day, the annual revenue derived from that number of men is sixty talents.
4.24
Out of this sum, if twenty talents are invested in additional slaves, the state will have forty talents available for any other necessary purpose. And when a total of ten thousand men is reached, the revenue will be a hundred talents.