Pool. This term applies when interests join together for mutual advantage.  The anthracite coal
pool, as it formerly existed, was an agreement whereby each company belonging to the pool was
to mine a certain percentage of the total production. The production for each month was
determined in the preceding month. The purpose of the pool was regulation of both output and
prices. By restricting the output to the consumptive demand control of prices was accomplished. A
schedule of prices was prepared for each month and all the companies made sales of coal in
accordance with it. The anthracite coal pool was declared illegal by the courts on the ground that it
was in restraint of trade.