Final answer:
In the short-run, when the economy is experiencing a negative output gap due to a demand shock, both inflation and unemployment tend to increase. This is shown as an upward movement along the short-run Phillips curve.
Step-by-step explanation:
a. In the short run, inflation and unemployment are both increasing.
In the short-run, when the economy is experiencing a negative output gap due to a demand shock, both inflation and unemployment tend to increase. This is because the decrease in aggregate demand leads to a decrease in economic activity and reduced production, causing businesses to lay off workers, which increases unemployment. At the same time, with lower demand, businesses may lower prices to attract customers, resulting in inflation.
b. This can be shown as an upward movement along the short-run Phillips curve.
The short-run Phillips curve represents the inverse relationship between inflation and unemployment. When the economy is experiencing a negative output gap, the Phillips curve shifts upwards, indicating that higher levels of inflation are associated with higher levels of unemployment. This is shown as an upward movement along the short-run Phillips curve, as both inflation and unemployment increase.