This section is from the book "American Law Of Real Estate Agency", by William Slee Walker. Also available from Amazon: American law of real estate agency.
Upon a suit by a broker to recover ordinary commissions for effecting the sale of a colliery, it appeared that commissions ranged from five to twenty-five per cent. Held, in the absence of evidence of a uniform custom or usage, that the measure of plaintiff's compensation should be the value of the service rendered. Potts v. Aechtermacht, 93 Pa. St. 138. See also Sec. 587.
 
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