Reduction in the value of an asset is called \(depreciation\) or \(capital\ consumption\).
\[ Fixed\ Capital\ Consumption\ (FCC) = Gross\ (G) - Net\ (N) \]
Net primary income represents the difference between income earned by nationals abroad and income earned by foreigners in the country.
\[ Net\ Primary\ Income\ = Income\ Earned\ by\ Nationals\ Abroad - Income\ by\ Foreigners\ in\ the\ Country \]
Or alternatively:
\[ Net\ Primary\ Income\ (NPI) = National\ (N) - Domestic\ (D) \]
Net transfers represent secondary income and are calculated as the difference between transfers received and transfers paid.
\[ Net\ Secondary\ Income\ (NSI) = Net\ Transfers\ (NT) = Transfers\ received - Transfers\ paid \]
Or:
\[ Net\ Transfers\ (NT) = Disposable\ Income\ (DI) - Income\ (I) \]