If investment increases by $10 billion, and the economy's mpc is 0.8, the aggregate demand curve will shift: group of answer choicesleftward by $50 billion at each price level. rightward by $10 billion at each price level. rightward by $50 billion at each price level. leftward by $40 billion at each price level.

Until recently, hamburgers at the city sports arena cost $4.70 each. the food concessionaire sold an average of 13 comma 000 hamburgers on game night. when the price was raised to $5.40, hamburger sales dropped off to an average of 6 comma 000 per night. (a) assuming a linear demand curve, find the price of a hamburger that will maximize the nightly hamburger revenue. (b) if the concessionaire had fixed costs of $1 comma 500 per night and the variable cost is $0.60 per hamburger, find the price of a hamburger that will maximize the nightly hamburger profit.