Gross Domestic Product is the dollar amount of the final goods and services in a country in a year. It includes on the final amounts of goods and services which means that it does not account for intermediate goods such as tires being purchased for a new car. It will instead include the price of the new car.
A consumer's purchase of a new bicycle would be included because this represents a final good. Second-hand goods are not to be counted because it is assumed that they have been counted by the GDP in the year they were produced.
