If a state government wants to collect the maximum tax revenue from a unit excise tax, which of the following would they tax?

Moving along the aggregate supply curve, when the price level rises,

A) the quantity supplied decreases. B) the quantity supplied increases. C) the aggregate demand curve shifts rightward. D) the aggregate demand curve shifts leftward. E) the quantity supplied does not change because the aggregate supply curve is a vertical line.

If the cross elasticity of demand between two goods is negative, are the goods substitutes or complements?

What will be an ideal response?