6. (2 points) Select one from the following statements which would shift the aggregate demand curve to the right: (a) A stock market crash (b) A Pandemic like Covid-19 (c) A sudden foreign demand increase for exports (d) A sudden increase in demand for imports from foreign countries 7. (2 points)The sticky-wage theory suggests an unexpectedly high price level lowers causing firms to hire more workers and produce a larger quantity of goods and services: (a) Nominal wage (b) real wage (c) sales (d) profits (e) None of (a) (b) (c ) (d) 8. (2 points) Which factor shifts the short-run aggregate-supply curve to the left? (a) A decrease in the expected price level (b) An increase in the expected price level (c)An increase in human capital (d) An advance in technological advances