Newly produced goods contribute to GDP, while resale of old goods does not.
A new car purchased in the year 2020 would be counted in the year 2020's GDP as it represents a newly produced good. The value of a dishwasher manufactured in 2020 and sold in 2020 would also be counted in the GDP. However, the value of a 2009 car you purchase from a car dealer in 2020 would NOT be counted in the year 2020's GDP since it is a resale of a previously produced good.
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