sentences:  He held an exclusive contractual arrangement with XERF's silent concession holders across the Rio Grande in Mexico.Arturo González was able to enforce his own contract with the concessionaire because his Inter-American Radio Advertising, Inc., held the purse strings to all of the money paid by American advertisers for airtime on XERF.Built into the costs of operation were not only the expenses incurred from the electrical bills and basic engineering help, but from payments for the physical security of the station as well as the attorney's own profit margin.