Q. Explain about Exchange-price or cost principle?

When resources are transferred between two parties such like buying merchandise on account the accountant must follow the exchange-price (or cost) principle in presenting that information. The exchange-price (or cost) principle requires an accountant to record transfers of resources at prices agreed on by the parties to the exchange at the time of exchange. This principle sets forth (a) what goes into the accounting system-transaction data (b) when it is recorded-at the time of exchange and (4) the amounts-exchange prices-at which liabilities, assets, stockholders' equity, revenues and expenses are recorded.