Final answer:
Remittances from workers abroad are not counted in a country's GDP but are included in its GNP. They represent significant financial flows that can substantially affect a country's economy, especially in nations with many citizens working overseas.
Step-by-step explanation:
Under GDP accounting rules, the wages of Brazilians working in Mexico that are sent back to Brazil are not counted as part of Brazil's GDP. Instead, these wages are referred to as remittances, which are indeed a crucial source of income for many countries, like Mexico, where they represent the second-largest source of foreign income.
Remittances involve a financial flow back to the worker's home country, which provides essential support for communities there. The concept relevant to these international income transfers is Gross National Product (GNP), which contrasts with GDP.
GNP includes economic activities by a country's citizens and businesses, wherever they are located, and thus counts remittances, whereas GDP is confined to economic activities within a country's geographical boundaries. For countries with a significant number of citizens working abroad, remittances can greatly affect the GNP and highlight the importance of international labor migration on an economy.