Answer: A: An unexpected increase in consumer spending results in decreased inventories of those who produce the goods.
B: An increase in the interest rate is equal to an increase in borrowing costs, therefore, those producers who wish to invest will have fewer viable projects since the cost of obtaining capital will be higher.
C: A sharp increase in the economy's growth rate of real GDP has the consequence that producers increase their production capacity and have a higher investment expense.
D: an unanticipated fall in sales causes producer inventories to grow as they sell less, leading to unplanned excess inventories.