Firms and Households: The Basic Decision-Making Units

Definitions and Roles

• Firm: An organization that transforms resources (inputs) into products (outputs). Firms are the primary producing units in a market economy.

• Entrepreneur: A person who organizes, manages, and assumes the risks of a firm, turning new ideas or products into successful businesses.

• Household: The consuming units in an economy, making decisions about what to buy and what resources to supply.

Example: A bakery (firm) hires workers (households) and sells bread to consumers (households).

Input Markets and Output Markets: The Circular Flow

Market Types and the Circular Flow Diagram

• Product or Output Markets: Markets where goods and services are exchanged.

• Input or Factor Markets: Markets where resources (land, labor, capital) used to produce goods and services are exchanged.

• Labor Market: Households supply work for wages to firms that demand labor.

• Capital Market: Households supply savings for interest or future profits; firms demand funds to buy capital goods.

• Land Market: Households supply land or real property in exchange for rent.

• Factors of Production: Land, labor, and capital—the key inputs into the production process.

Example: Households supply labor to a car manufacturer (firm) and receive wages; the firm sells cars to households in the product market.

Additional info: The circular flow diagram illustrates the flow of goods and services clockwise and the flow of money counterclockwise between households and firms.

Demand in Product/Output Markets

Determinants of Household Demand

• Price of the Product: The current market price directly affects the quantity demanded.

• Income: The sum of all earnings by a household in a given period (flow measure).

• Wealth (Net Worth): The total value of what a household owns minus what it owes (stock measure).

• Prices of Other Products: The cost of substitutes and complements influences demand.

• Tastes and Preferences: Individual likes and dislikes shape demand.

• Expectations: Anticipations about future income, wealth, and prices affect current demand.

Quantity Demanded: The amount of a product a household would buy in a given period at the current market price, holding all else constant (ceteris paribus).

Law of Demand

• Law of Demand: There is a negative relationship between price and quantity demanded, ceteris paribus. As price rises, quantity demanded falls; as price falls, quantity demanded rises.

• Demand Schedule: A table showing how much of a product a household would buy at different prices.

• Demand Curve: A graph illustrating the relationship between price and quantity demanded. It slopes downward.

Example: If the price of gasoline decreases, households will generally buy more gasoline.

Other Determinants of Demand

• Normal Goods: Demand increases as income increases.

• Inferior Goods: Demand decreases as income increases.

• Substitutes: Goods that can replace each other; an increase in the price of one increases demand for the other.

• Perfect Substitutes: Identical products.

• Complements: Goods that are used together; a decrease in the price of one increases demand for the other.

Example: If the price of Coca-Cola rises, demand for Pepsi (a substitute) increases. If the price of printers falls, demand for ink cartridges (a complement) rises.

Shifts vs. Movements Along the Demand Curve

• Movement Along the Demand Curve: Caused by a change in the price of the good itself.

• Shift of the Demand Curve: Caused by changes in income, preferences, prices of other goods, or expectations.

Example: An increase in income shifts the demand curve for normal goods to the right.

From Household Demand to Market Demand

• Market Demand: The sum of all quantities of a good demanded by all households at each price.

Example: If Alex and Jamie each demand 5 units of a good at $2, market demand at $2 is 10 units.

Supply in Product/Output Markets

Determinants of Supply

• Quantity Supplied: The amount of a product a firm is willing and able to offer for sale at a particular price during a given period.

• Supply Schedule: A table showing how much of a product firms will sell at alternative prices.

• Supply Curve: A graph illustrating the relationship between price and quantity supplied. It slopes upward.

• Law of Supply: There is a positive relationship between price and quantity supplied, ceteris paribus.

Example: If the price of soybeans rises, farmers will supply more soybeans.

Other Determinants of Supply

• Cost of Production: Includes input prices (labor, land, capital), technology, and energy costs.

• Prices of Related Products: If the price of a related product rises, firms may shift production to that product.

Shifts vs. Movements Along the Supply Curve

• Movement Along the Supply Curve: Caused by a change in the price of the good itself.

• Shift of the Supply Curve: Caused by changes in input prices, technology, or prices of related goods.

Example: A new technology that reduces production costs shifts the supply curve to the right.

From Individual Supply to Market Supply

• Market Supply: The sum of all quantities supplied by all producers at each price.

Example: If two farmers each supply 20 bushels of wheat at $3, market supply at $3 is 40 bushels.

Market Equilibrium

Equilibrium, Excess Demand, and Excess Supply

• Equilibrium: The condition where quantity supplied equals quantity demanded; there is no tendency for price to change.

• Excess Demand (Shortage): Quantity demanded exceeds quantity supplied at the current price; price tends to rise.

• Excess Supply (Surplus): Quantity supplied exceeds quantity demanded at the current price; price tends to fall.

Example: If the price of wheat is below equilibrium, there will be a shortage, causing the price to rise until equilibrium is reached.

Market Equilibrium with Equations

• Assume linear demand and supply curves:

Inverse demand curve:

Inverse supply curve:

Set quantity demanded equal to quantity supplied to solve for equilibrium:

Substitute back into either equation to find equilibrium price .

Example: If , , , , then and .

Changes in Equilibrium

• Shifts in demand or supply curves result in new equilibrium prices and quantities.

• For example, a leftward shift in supply (e.g., due to a freeze in the coffee market) raises equilibrium price and lowers equilibrium quantity.

Summary Table: Movements vs. Shifts

Key Terms and Concepts

• Capital Market

• Complements

• Demand Curve

• Demand Schedule

• Entrepreneur

• Equilibrium

• Excess Demand (Shortage)

• Excess Supply (Surplus)

• Factors of Production

• Firm

• Households

• Income

• Inferior Goods

• Input or Factor Markets

• Labor Market

• Land Market

• Law of Demand

• Law of Supply

• Market Demand

• Market Supply

• Movement Along a Demand Curve

• Movement Along a Supply Curve

• Normal Goods

• Perfect Substitutes

• Product or Output Markets

• Profit

• Quantity Demanded

• Quantity Supplied

• Shift of a Demand Curve

• Shift of a Supply Curve

• Substitutes

• Supply Curve

• Supply Schedule

• Wealth or Net Worth

Looking Ahead: Markets and the Allocation of Resources

• Markets answer the basic economic questions: what is produced, how it is produced, and who gets what is produced.

• Demand curves reflect willingness and ability to pay, influenced by incomes, wealth, preferences, prices of other goods, and expectations.

• Firms seek profit by choosing efficient production methods.

• When goods are scarce, prices rise, rationing goods to those willing and able to pay.