Market Dynamics: Supply, Demand, and Competition Explained
Understanding Market Fundamentals
A market is a group of buyers and sellers of a good or service. The terms supply and demand apply to the conduct of individuals in their interaction with others in the markets:
- Buyers determine demand.
- Sellers determine supply.
Types of Competitive Markets
A competitive market is one in which there are many buyers and sellers, so neither party can independently affect the price.
- Perfect Competition: Features homogeneous products and many buyers and sellers. Participants are price-takers.
- Monopoly: A single seller who sets the price.
- Oligopoly: A market with few sellers who are not always aggressive competitors.
- Monopolistic Competition: Many sellers offering differentiated products, allowing each to set their own price.
The Law of Demand
The Law of Demand states that, holding everything else constant, the quantity demanded of a good falls when the price of that good increases.
- Demand Curve: A graph illustrating the relationship between the price of goods and the quantity demanded.
- Market Demand: The sum of all individual claims. The market demand curve shows how the total quantity demanded varies as the price changes, keeping other factors constant. It is obtained by adding individual demand curves horizontally.
Related Goods
- Substitute Good: When an increase in the price of one good increases the demand for the other.
- Complementary Good: When an increase in the price of one good decreases the demand for the other.
The Law of Supply
The Law of Supply states that, holding everything else constant, the quantity of a good supplied increases when its price increases.
- Market Supply: The sum of all individual bids.
- Market Supply Curve: Shows how the total amount supplied varies as the price changes, keeping other factors constant. It is obtained by adding individual supply curves horizontally.
Market Equilibrium and Imbalance
- Surplus: Occurs when the price is above the equilibrium price, resulting in quantity supplied exceeding quantity demanded.
- Shortage: Occurs when the price is below the equilibrium price, resulting in quantity demanded exceeding quantity supplied.