Sam Shiraz is in the habit of drinking wine while watching pay-per-view movies. She always drinks four glasses of wine for each film she watches. Please put wine on the horizontal axis.

a) If the price of wine increases by 50%, then her income-consumption curve will tilt/shift [ Select ] ["to the left", "to the right", "not enough information to determine", "none of the above"]

b) If the price of wine increases by 25%, then the slope of her Engel curve for movies will [ Select ] ["increase", "decrease", "stay the same", "not enough information to determine", "none of the above"]