Remittances are standard components of secondary income (current transfers) in the current account of the balance of payments and directly contribute to national disposable income, making this a matter of economic definition.
The claim outlines standard macroeconomic accounting definitions regarding how remittances are classified within the balance of payments and their relation to national disposable income. Because this reflects standard international accounting frameworks (such as IMF Balance of Payments Manual guidelines) and foundational macroeconomic definitions, no formal citation is necessary.