Your income response for bicycle riding changes with the amount of income you earn. At lowlevels of income, you view bicycle riding as an inferior good and substitute other types of transportation (e.g., auto travel) as your income rises. However, you view bicycle riding as a normal good after your income rises above a particular level. What shape does your Engel curve for bicycle riding have?

Select one:

a. C-shaped

b. Upward sloping

c. Horizontal line

d. Vertical line