Answer to the question no- 1
Demand is the number of customers who are willing and able to buy products at different prices over some time. The demand for any product means the desire of the customer to deliver better, the desire and ability to pay for it.
Supply is the number of goods or services that suppliers wish to offer to customers at a given price level over a while.
Answer to the question no- 2
Market Equilibrium is a market state where market supply equals market demand.
Ans: to the question no-3:
Given that,
Qd = 80-4p
Qs = 60+4p
Market equilibrium
Qd = Qs
=> 80-4p = 60+4p
=> -4p-4p = 60-80
=> -8p = -20
=> 8p = 20
=> p = 20/8
∴ P* = 2.5
Now, put p = 2.5 in Qd function-
So, Q = 80-4(2.5)
= 80-10
= 70
∴ Q* = 70