Equilibrium in which market is adjusted by invisible hands, and can be defined as zero excess demand and zero excess supply?

The price elasticity of demand is different at different points on the linear demand curve. Arrange the elasticity point on a downward sloping (left to right) demand curve.

(A). |ed| < 0

(B). |ed| = 1

(C). |ed| > 1

(D). |ed| < 1

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Let us consider a linear demand curve $q = a - bp$. On the same demand curve, arrange the elasticity in ascending order.

(A) $|e_D| = 1$.

(B) $|e_D| < 1$.

(C) $|e_D| > 1$.

(D) $|e_D| = 0$.

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Suppose, there is an increase in the income of the consumers, that shifts the demand curve to the right. What will be the change in the equilibrium condition?

What is the formula for the price elasticity of demand for a good?

Match List-I with List-II

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In the perfect competition, the government regulation on goods which results in the creation of a black market is called ?