Although GDP is a reasonably good measure of a nation's output, it does not necessarily include all transactions and production for that nation. Which of the following scenarios are either not accounted for or measured inaccurately by either the income or the expenditure methods of calculating GDP for the United States? Check all that apply.

a)The value of babysitting services, when the babysitter is paid in cash and the transaction isn't reported to the government
b)Funds spent by city governments to renovate their buildings
c)The variety of goods available to consumers
d)The costs of air and water pollution

When a U. S. company purchases and imports automotive parts from Canada to use to build cars within the United States, this purchase increases the (investment or goverment purchases or consumption) component of GDP while also (increasing or decreasing) net exports by the same amount. Therefore, the purchase of automotive parts from Canada causes (no overall charge or an overall increase or an overall decrease) in US GDP.