(a)
Price of gasoline will not cause a change in its demand, since the non-price determinants of demand are unchanged. The demand curve will not shift.
(b)
As per law of demand, higher price of gasoline will decrease its quantity demanded, causing an upward movement along the demand curve.
January 2007, the price of gasoline was $2.38 a gallon. By May 2008, the price of...