Sweden, where Saab is produced, counts the car as an export (X) which adds to Sweden's GDP.
US, where Saab is purchased, counts the purchase as an increase in consumer spending (C) when the car is sold at the dealership BUT it is ALSO counts as an IMPORT (M), which causes a reduction to NET EXPORTS (NX). Since the values of the purchase of the car (C) and the Import (M) are the same, there is no impact to the US GDP. Essentially, the Saab cancels itself out of counting in US's GDP.
General Motors Corporation (a U.S.-based firm) produces a Saab vehicle in Sweden, and sells it in the United States. In which country's GDP does the Saab increase GDP?
Sweden and the United States
The United States because it was sold there
The United States because GM is a U.S. company
Sweden because it was produced there