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WordNet
invisible balance

n. the difference in value over a period of time of a country's imports and exports of services and payments of property incomes

Wikipedia
Invisible balance

The invisible balance or balance of trade on services is that part of the balance of trade that refers to services and other products that do not result in the transfer of physical objects. Examples include consulting services, shipping services, tourism, and patent license revenues. This figure is usually generated by tertiary industry. The term 'invisible balance' is especially common in the United Kingdom.

For countries that rely on service exports or on tourism, the invisible balance is particularly important. For instance the United Kingdom and Saudi Arabia receive significant international income from financial services, while Japan and Germany rely more on exports of manufactured goods.