A. If product B become more fashionable its demand will rise the reason is that the demand for goods which form a part of habbits, tastes, and fashion is always inelastic because people prefer to purchase them even though their prices undergoes a big change
B. if price of substitute product C falls the demand for product B will decrease( the demand is generally elastic)
C. When income of a consumer decreases he purchases less of superior good and more of inferior goods so demand of product B will rise(when B is an inferior good)
D. the demand for product B at present time will fall so consumers will buy it when its price will be lower in future
E. if the price of complementary good D falls the demand for product B will rise
e.g increase in price of petrol decreases in demand for cars
or decrease in price of petrol increases the demand for cars
B. if price of substitute product C falls the demand for product B will decrease( the demand is generally elastic)
C. When income of a consumer decreases he purchases less of superior good and more of inferior goods so demand of product B will rise(when B is an inferior good)
D. the demand for product B at present time will fall so consumers will buy it when its price will be lower in future
E. if the price of complementary good D falls the demand for product B will rise
e.g increase in price of petrol decreases in demand for cars
or decrease in price of petrol increases the demand for cars