    Sentence 1: To begin. with, the adoption of  bor codes came:before rapid. replenishment  ‘arrangements becouse’ retailers required a  low-cost means of-collecting information: at  the detailed: product level for their own  use'that: is, they. first developed an. efficient  method-for scanning prices ot the. check-out  register and ‘tracking products ‘for. internal  inventory purposes. . :    Sentence 2: There are several cheap methods  for retailer. information collection, but: bar:  codes are the best. ~