When you pay by check, you also benefit from float. If you send it by mail, the legal date of payment is the date of the payment is the date of the postmark. You earn mail float on the time it takes the check to be delivered to the recipient . It also takes time for the check to go through the clearing process. You earn bank float until your deposit is debited. If the total delay is a week, you earn an extra week’s interest on the amount of the payment after it has legally been made.
Methods of payment that do not involve float seem less attractive. The transaction cost of electronic payment (EFTPOS, for example) is much lower than that of payment by check or credit card. It is also much faster. But this speed is a disadvantage to you because it reduces float.
The loss of float is one reason debit cards have been slow to catch on in the United States. Checks and credit cards offer greater float. In Europe, payments by cash and giro predominate. Since neither method offers float, the greater convenience of the debit card is not offset by any loss of float, and debit cards have proven very popular.
The Use of Cash. Immediate payment in cash by definition involves no float. Why is it, then, that there are so many cash payments? There are, in fact, good reasons why immediate payment in cash is the preferred method both for very small payments and for very large ones .
Cash is the preferred method for small payments because it is the only method that involves no credit (no promises). Methods of payment that involve credit involve substantial fixed costs. For example, the costs of credit verification and of clearing a check do not depend on the amount of the check. Consequently, a check is relatively more expensive for small transactions. Therefore, when you buy a newspaper at the corner newsstand, a check or credit card will not be accepted. You have to pay in cash.
For quite different reasons, immediate payment in cash is also preferred for very large payments. For large payments, the recipient may not be willing to accept the loss due to float. At an interest rate of 5% per annum, a day’s delay on a payment of $100 million costs about $13,000 in forgone interest. Moreever, many large payments are related to very-short-term lending-perhaps for as little as a day. Lending money for a day and sending the money by check would not make much sense. Large payments in “cash” are made by Fedwire.