5. Between 2018 and 2019 in the US, consumption increased by $20bn, out of which $5bn went to imported goods. Investment went up by $10bn, all spent on domestically produced goods and services. Total government spending did not change but the government shifted $12bn worth of spending from a foreign contractor to a domestic contractor. Exports decreased by $3bn. No other change occurred. What is the total change in US GDP between 2018 and 2019? a. + $22 bn b. + $34 bn c. + $27 bn d. + $39 bn