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If the residuals from a fitted regression violate the assumption of homoscedasticity, we know that:
Second-hand Cars
Vehicles that have been previously owned and used by one or more owners.
Current-dollar GDP
Gross Domestic Product measured in current prices, without adjusting for inflation or deflation.
Constant-dollar GDP
Gross domestic product figures that have been adjusted for inflation to reflect the real value of goods and services produced in a country.
Underground Economy
Economic transactions that occur outside of government regulation or taxation, including illegal activities and unreported income from legal activities.
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