Market Equilibrium

Determination of Equilibrium Price and Quantity

Market equilibrium occurs when the quantity demanded (Qd) equals the quantity supplied (Qs) at a specific price, known as the equilibrium price. This balance ensures no surplus or shortage exists.

• Mathematically, it is found by solving the equations:

• Qd=Qs

Qd=Qs

• For example, if Qd=100−2P and Qs=20+3P, equilibrium occurs at P=16 and Q=68 .

Example:
If the price of strawberries is ₹50/kg, and both producers and consumers agree to trade 500 kg at this price, ₹50 is the equilibrium price, and 500 kg is the equilibrium quantity.

Price Mechanism: How Markets Self-Correct

The price mechanism is the process by which prices adjust to eliminate surpluses/shortages and allocate resources efficiently. It performs three key functions:

1. Signalling Function:

   • Prices convey information about scarcity or abundance.

   • Example: Rising oil prices signal producers to drill more and consumers to use less.

2. Incentive Function:

   • Higher prices incentivize producers to supply more; lower prices encourage consumers to buy more.

   • Example: A surge in coffee prices prompts farmers to grow more coffee beans.

3. Rationing Function:

   • Prices ration scarce goods to those willing/able to pay.

   • Example: During a wheat shortage, higher prices ensure only those valuing wheat highly purchase it.

Process:

• Surplus → Prices fall → Qd rises, Qs falls → Equilibrium restored.

• Shortage → Prices rise → Qd falls, Qs rises → Equilibrium restored.