RIO DE JANEIRO, May 18 : Volkswagen is concerned about declining resale values of its vehicles as lower-priced Chinese competitors expand in the Brazilian market, the company's head in Brazil, Ciro Possobom, told Reuters on Monday. "While new entrants are entering aggressively and putting downward pressure on prices, we believe we are well positioned," Possobom said, adding that the company will not engage in a price war with Chinese competitors. Chinese automakers have rapidly expanded in