Effective supply chain management is part of the company's success. Gonzalez owns the manufactur- ing firm Laboratorios Best, which supplies about 20 percent of the generic products sold by the retail chain, with the rest purchased from other domestic manufacturers. Whereas some national health lead ers call Gonzalez a marketing genius, others attack the business model claiming that the drugs it sells are inferior and less potent than brand-name pharma- ceuticals and that they can endanger patients. Gonzalez responds by saying that he's a champion of the poor and by assuring the public that new laws will require all generic drugs to be tested for potency Meanwhile, Dr. Simi appeals to moms and kids, Simi's Chicas appeal to men, and low prices appeal to the masses.