simply an amount that accounts for any statistical errors and assures that the current and capital accounts sum to zero. By the principles of double entry accounting, an entry in the current account gives rise to an entry in the capital account, and in aggregate the two accounts automatically balance. A balance isn't always reflected in reported figures for the current and capital accounts, which might, for example, report a surplus for both accounts, but when this happens it always means something has been missed – most commonly, the operations of the country's central bank – and what has been missed is recorded in the statistical discrepancy term (the balancing item). An actual balance sheet will typically have numerous sub headings under the principal divisions. For example, entries under Current account might include: Trade – buying and selling of goods and services Exports – a credit entry Imports – a debit entry Trade balance – the sum of Exports and Imports Factor income – repayments and dividends from loans and investments Factor earnings – a credit entry Factor payments – a debit entry Factor income balance – the sum of earnings and payments. Especially in older balance sheets, a common division was between visible and invisible entries. Visible trade recorded imports and exports of physical goods (entries for trade in physical goods excluding services is now often called the merchandise balance). Invisible trade would record international buying and selling of services, and sometimes would be grouped with transfer and factor income as invisible earnings. The term "balance of payments surplus" (or deficit – a deficit is simply a negative surplus) refers to the sum of the surpluses in the current account and the narrowly defined capital account (excluding changes in central bank reserves). Denoting the balance of payments surplus as BoP surplus, the relevant identity is Measurements and definitions The balance of payments takes into account payments for a country's exports and imports of goods, services, financial capital, and financial transfers. It is prepared in a single currency, typically the domestic currency for the country concerned. The balance of payments accounts keep systematic records of all the economic transactions (visible and non-visible) of a country with all other countries in the given time period. In the BoP accounts, all the receipts from abroad are recorded as credit and all the payments to abroad are debits. Since the accounts are maintained