Country Z does not trade with any other country. Its GDP is $20 billion. Its government purchases $3 billion worth of goods and services each year, collects $3 billion in taxes, and provides $2 billion in transfer payments to households. Private saving in Country Z is $4 billion. What is the investment in Country Z? [This question is tricky but you should have no problem once you figure out what the total government spending is]. Select one: O $2 billion $5 billion O $3 billion O $4 billion