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Rh C, three hours, 1½ b. B and C each give half of b for a, and all have their equal daily maintenance for equal daily work.

To carry the example a single step farther, let three articles, a, b, and c be needed.

Let a need one hour's work, b two, and c four; then the day's work must be seven hours, and one man in a day's work can make 7 a, or 3½b, or 1¾ c.

Therefore one A works for a, producing 7 a; two B's work for b, producing 7 b; four C's work for c, producing 7 c.

A has six a to spare, and gives two a for one b, and four a for one c. Each B has 2½ b to spare, and gives ½ b for one a, and two b for one c.

Each C has ¾ of c to spare, and gives ½ 'c for one b, and ¼ of c for one a. And all have their day's maintenance.

Generally, therefore, it follows that if the demand is constant, the relative prices of things are as their costs, or as the quantities of labour involved in production.

64. Then, in order to express their prices in terms of a currency, we have only to put the