Consider a negatively sloping, usual demand curve for coffee. Which of the following describes a shift in the demand curve, ceteris paribus?
(a) Increase in the price of coffee
(b) Increase in the price of tea
(c) Increase in the income of the consumers
1
All - (a), (b) and (c)
2
Only (a)
3
Only (b)
4
both (b) and (c)