A good purchase means buying goods quality goods in correct bulk at right time, right place and right price. The correct purchase can help to bring down the cost buying expense by more than 10%, which would help to increase the profits of the firm. This way profit of firm not only depends upon purchase of firm. For good purchases, letters of inquiry should be written to various reputed traders and firms inquiring about terms of trade, price of products, weight, size, bulk, credit facility and terms and conditions of trade.