In: Economics
The weekly demand and supply schedules for pens in a free market are presented below:
| 
 Price (Rs/unit)  | 
 9  | 
 8  | 
 7  | 
 6  | 
 5  | 
 4  | 
 3  | 
 2  | 
 1  | 
| 
 Quantity demanded (units)  | 
 4  | 
 6  | 
 8  | 
 10  | 
 12  | 
 14  | 
 16  | 
 18  | 
 20  | 
| 
 Quantity supplied (units)  | 
 20  | 
 18  | 
 16  | 
 14  | 
 12  | 
 10  | 
 8  | 
 6  | 
 4  | 
| 
 (a)  | 
 Plot the demand and supply curves  | 
 
  | 
| 
 (b)  | 
 What is the equilibrium price and quantity?  | 
(a) part a solution is given below -

(b) In the figure attached above point E shows equilibrium where both curve intersect each other. Therefore, equilibrium price is Rs 5 and equilibrium quantity is 12 units of pens.