1. Aggregate Demand -- For each of the following, determine whether the aggregate demand (AD) curve will shift to the right, to the left, or remain unchanged. Explain your answers. (4 points) a. Consumers and firms become more pessimistic about the current state of the economy. (Circle one) shift to the right, to the left, or remain unchanged Explain: b. The value of wealth in the economy is steadily growing. (Circle one) shift to the right, to the left, or remain unchanged Explain: c. The aggregate price level in the economy has risen. (Circle one) shift to the right, to the left, or remain unchanged Explain: d. The government has increased spending on roads, bridges and other infrastructure. (Circle one) shift to the right, to the left, or remain unchanged Explain