Manufacturers and jobbers of certain products also find it necessary to store large quantities of their wares at distributing centers that they may promptly supply the trade. Another reason for this practice is a financial one. When a manufacturer exchanges his wares for a warehouse receipt, he can immediately borrow on its security, thus securing capital to carry on his business until the regular selling season for his particular product. The merchandise broker and manufacturers' agent sometimes have their own warehouses and combine the business of buying and selling with that of storage and, if they possess sufficient capital, advance money to the manufacturer. Perishable products handled by the produce commission merchant are also stored in cold storage warehouses, both to preserve them and to hold for more favorable market conditions. STORAGE ACCOUNTS =59.= Storage charges are usually based on a 30 day period, though sometimes for shorter periods, and any period less than a full month is charged for at the 30 day rate. The storage is frequently charged for the exact time that goods are in the warehouse, that is, the amount is figured for each amount withdrawn. The following example demonstrates this, storage being charged on each quantity withdrawn at the rate of 10c per case per month. ════════════════════╤═══════════════╤═════╤════╦═══════ Received │ Delivered │Time │Rate║Amount ────┬──┬────────────┼────┬──┬───────┼─────┼────╫────┬── Nov.│15│600 cs. eggs│Dec.│10│100 cs.│1 mo.│10c ║ 10│00 │ │ │ │ │ │ │ ║ │ │ │ │Jan.│ 6│300 cs.│2 mo.│20c ║ 60│00 │ │ │ │ │ │ │ ║ │ │ │ │Feb.│14│200 cs.│3 mo.│30c ║ 60│00 ────┼──┼────────────┼────┼──┼───────┼─────┼────╫────┼── │ │ │ │ │ Total │ │ ║ 130│00 This is known as simple storage. Another method is to charge storage for the average time at a given rate per month of 30 days. This method is most commonly used when receipts and deliveries are frequent, and is called average storage. The following example demonstrates the method.