the adjustment related to changes in inventory converted the cost of sales expense item to a cash basis on the implicit assumption that all purchases for inventory were made for cash. the adjustment related to accounts payable relaxes this assumption and deals at the same time with purchases of resources that are expenses of the period, such as selling expenses, rather than assets. since, in a sense, accounts payable is a mirror image of accounts receivable, the payables adjustment is algebraically the opposite of the receivables adjustment. thus, if the balance in accounts payable increases during the period, the amount of the increase is added to net income to reflect the fact that