jorge, the shipping manager at Durable Products, writes a memo proposing that that they stop using RoadHog Trucking Company and ship everything by L.B. Haines. The reason he gives is that two of the accounts that have been shipping by L.B. Haines during the last year increased their orders by more than 10%, so he is certain that switching trucking firms will cause other accounts to grow too. The executives of the company do not accept Jorge's suggestion. Why was his memo unconvincing?