To encourage sales to customers who would have bought at a later date. This usually requires additional expense and effort upon the part of the vendor. Short term cash flow will increase (due to a higher number of sales). On the other hand, sales in subsequent periods will be reduced as those who would have placed orders in those time periods will have already made their purchases. term cash flow will increase (due to a higher number of sales). On the other hand, sales in subsequent periods will be reduced as those who would have placed orders in those time periods will have already made their purchases.