Final answer:
The Michigan family's spending during their trip to France does not contribute to the 2021 U.S. GDP. Instead, it is recorded as an import and would subtract from the U.S. GDP according to the formula C + I + G + (X - M). To calculate U.S. GDP, such international spending must be considered as part of import figures.
Step-by-step explanation:
The question asks about the contribution to 2021 U.S. GDP of a Michigan family's expenses during a trip to France. To calculate a country's GDP, the formula GDP = C + I + G + (X - M) is used, where C represents consumption spending, I stands for business investment, G is government purchases, and (X - M) are exports minus imports. However, when a U.S. family spends money on goods and services in France, this spending adds to the GDP of France, not the United States. Instead, it is considered an import from the perspective of the U.S. Therefore, the spending in France by the Michigan family would subtract from the U.S. GDP, as it increases the value of imports (M).
To exemplify with a hypothetical GDP calculation for Country A: GDP = $2,000 billion + $50 billion + $1,000 billion + ($20 billion - $40 billion) = $3,030 billion. In this scenario, 'Country A' is generic and not specific to the question asked about U.S. GDP. In reference to the U.S., such international spending would be factored into the GDP calculation as an increase in imports, thus reducing the net export (X - M) value component of U.S. GDP.