Market Clearing

Definition: A perfectly competitive market is characterized by many buyers and sellers, where products are identical and no single entity can influence the market price.
Context: Focus on Electric Vehicles (EVs) as a representation of this type of market.

Supply Dynamics
- As price increases, the quantity supplied increases, holding other factors constant (C.P.).
- Firm Supply: A firm’s supply curve reflects its marginal cost (MC) after diminishing marginal returns (DMR) set in.
- Total Market Supply: The summation of every firm's quantity supplied at each price level forms the market supply curve, which is essentially the MC for all firms.

Demand Dynamics
- As price rises, the quantity demanded decreases, holding other factors constant.
- This phenomenon is explained by the Diminishing Marginal Utility concept, wherein the perceived value of an additional unit decreases as consumption increases.
- In a perfectly competitive market, there are numerous buyers, leading to market demand reflecting the marginal benefit (MB) to all buyers.

Equilibrium Concept
- Equilibrium Quantity ($Q^*$): The amount supplied and demanded at the equilibrium price.
- Equilibrium Price ($P^*$): The price at which quantity supplied (Qs) equals quantity demanded (Qd).
- Characteristics of Equilibrium:
- It represents a state where there is no tendency for change.
- At equilibrium, there are no shortages or surpluses in the market.

Case Study: If $P^* = $10,000, then:
- This price leads to an equilibrium where the quantity supplied matches the quantity demanded at this price level.

Increasing Demand
- Shifts from Demand curve D1 to D2 increase the equilibrium price.
- The new equilibrium price will be higher than the current market price, leading to initial surplus conditions.
- As demand increases, price adjustments may take time to reflect in the market leading to shortages until market price adapts to $P^*$.
Characteristics of Surplus
- A surplus occurs when quantity demanded (Qd) is less than quantity supplied (Qs).
- Correcting surpluses involves price adjustments upwards until equilibrium is restored.
Decreasing Demand
- Shifts from Demand curve D1 to D2 decrease the equilibrium price.
- The new equilibrium may initially be below the old market price causing a surplus situation.
- The surplus persists until the price adjusts upwards to the new equilibrium price $P^*$.

Market Clearing
- The process by which the market reaches a new equilibrium price after shifts in supply or demand is referred to as "market clearing."
- Market clearing removes either a surplus or shortage by adjusting prices to reflect the new equilibrium.

Positive Impact of New Information
- Example: If new studies reveal that chocolate has health benefits, it increases demand, shifting the demand curve right (D1 to D2).
- This results in a higher equilibrium price to clear the heightened demand for chocolate.
Negative Impact of New Information
- Example: If new information suggests that chocolate causes adverse health effects (like hair loss), demand decreases shifting the demand curve left (D1 to D2).
- The result is a surplus, leading to lower equilibrium prices until the market adjusts.

Concurrent Changes
- When both demand and supply curves shift simultaneously (for example, a decrease in demand and an increase in supply):
- New equilibrium dynamics depend on the magnitude of each shift.
- Specific outcomes for equilibrium price and quantity may diverge based on the intensity of changes in supply versus demand curves.