Bulk purchasing or mass buying is the purchase of much larger quantities than the usual, for a unit price that is lower than the usual.
Wholesaling is selling goods in large quantities at a low unit price to retail merchants. The wholesaler will accept a slightly lower sales price for each unit, if the retailer will agree to purchase a much greater quantity of units, so the wholesaler can maximize profit. A wholesaler usually represents a factory where goods are produced. The factory owners can use economy of scale to increase profit as the quantity sold increases.
