What is the elasticity of demand for the following goods? Explain. What is the shape of the demand curve?

a. Demand for a blood transfusion by an accident victim

b. Demand by students for green erasers 1, After Chelsea’s income increased from $12,000 to $18,000 a year, her purchases of album downloads increased from 10 to 40 downloads a year. Calculate Chelsea’s income elasticity of demand for albums using the midpoint method.