4. (Figure: Aggregate Demand Shift) 300 250 200 Aggregate Price Level if 150 100 50 1.000 2.000 3.000 4.000 6.000 0.000 Aggregate Output (0) Which of the following may be an explanation for the shift in aggregate demand from line A to line B? Oa. Goods and services become less competitive and exports fall. Ob. Interest rates fall and boost investments. Oe. Prices fall and increase real wealth. Od. Consumer confidence declines and consumption spending falls. 5. is the output of goods and services demanded at different price levels