What you will be able to do
distinguish movement along a curve from a shift; use a schedule to identify market equilibrium and predict change; explain wages through productivity, bargaining, institutions, discrimination, and labor-market power
Supply, Demand, Labor, Wages, and Productivity
How do supply and demand models explain price and quantity, and why do wages and productivity require additional institutional analysis?
Activate what you know
At a low ticket price, buyers want 100 seats but sellers offer 40; at a higher price, buyers want 60 and sellers offer 120. Predict pressure on price in each case
- demandquantities buyers are willing and able to purchase at different prices during a period, other things equal
- supplyquantities sellers are willing and able to offer at different prices during a period, other things equal
- equilibriummodel point where quantity demanded equals quantity supplied
- shortagequantity demanded exceeds quantity supplied at the stated price
- surplusquantity supplied exceeds quantity demanded at the stated price
- elasticityresponsiveness of quantity demanded or supplied to a change in price or another factor
- labor demandemployers’ demand for work, derived partly from the value workers can help produce
- productivityoutput per unit of input, such as output per labor hour
1
Supply and Demand Are Conditional Models
Demand generally slopes downward because buyers purchase less at higher prices, other things equal. Supply generally slopes upward because higher prices can make additional production worthwhile, though exceptions exist. A change in the good’s own price causes movement along its curve. A different factor—income for a normal good, preferences, number of buyers, input cost, technology, expectation, tax, or number of sellers—shifts a curve. Confusing movement and shift produces contradictory predictions. At a price below equilibrium, quantity demanded exceeds quantity supplied, creating a shortage and pressure for price or nonprice allocation to change. Above equilibrium, a surplus creates pressure for adjustment. Equilibrium is a model result, not a guarantee of dignity, access, competition, or environmental responsibility. Market power, rationing, search cost, price controls, discrimination, externalities, and incomplete information can alter observed outcomes. Elasticity helps predict how strongly quantity responds and who bears a tax or disruption
2
Labor Markets Need More Than a Simple Price Story
Employers demand labor partly because workers help produce goods or services that can be sold or publicly valued. Education, experience, tools, management, infrastructure, technology, and team organization affect productivity. Labor supply reflects population, care duties, health, migration, commuting, job conditions, benefits, discrimination, and alternatives—not only wage. A single employer dominating local hiring creates monopsony power and can hold wages below a more competitive level. Collective bargaining can increase worker leverage and set rules beyond pay. Productivity growth raises the economy’s capacity to produce and can support higher real wages, shorter hours, profit, public revenue, or lower prices. It does not determine distribution automatically. Ownership, bargaining power, labor standards, market concentration, tax policy, and discrimination influence who receives gains. Nominal wage is the dollar amount; real wage adjusts purchasing power for prices. Good analysis calculates output per hour, observes compensation and conditions, and asks whether higher measured output came from better tools, skill, work intensification, unpaid labor, or shifted costs
Name the Curve, Direction, and Cause
Say demand or supply, shifts left or right, because of which nonprice determinant; then predict price and quantity separately
Run the Model, Then Add Institutions
First predict direction with supply and demand. Then test market power, rules, rights, externalities, distribution, and evidence before judging welfare
Equilibrium Is Not the Same as Fair
A market can clear while essential goods remain unaffordable, workers face discrimination, or costs fall on outsiders
Market and Wage Lab
Use the lesson’s fictional schedules to find equilibrium, model a shift, calculate productivity, and explain why wage change may differ from productivity change
Supply and demand isolate price-quantity relationships, while labor and wage outcomes also depend on productivity, bargaining, law, discrimination, market power, conditions, and distribution of gains
Practice and answer guide
Work through all 12 questions. Open an answer only after you have written or explained your response.
- 1. At prices $5, $10, and $15, quantity demanded is 100, 80, and 60 while quantity supplied is 40, 80, and 120. What is equilibrium?
Check answer
At $10, quantity demanded and quantity supplied both equal 80, so equilibrium is price $10 and quantity 80
- 2. At $5, is there a shortage or surplus, and of how many units?
Check answer
Shortage of 60 units because 100 demanded minus 40 supplied equals 60
- 3. At $15, is there a shortage or surplus, and of how many units?
Check answer
Surplus of 60 units because 120 supplied minus 60 demanded equals 60
- 4. Complete the curve-shift organizer when a factory’s input cost falls
Check answer
Supply; rightward; lower equilibrium price; higher equilibrium quantity, other things equal
- 5. Why does a change in the good’s own price cause movement rather than a curve shift?
Check answer
A curve already records quantities at each own price while holding determinants constant; moving to another listed price selects a different point on that same relationship
- 6. An increase in buyer income raises demand for a normal good. Predict equilibrium price and quantity, holding supply fixed
Check answer
Both equilibrium price and quantity rise, other things equal
- 7. Why is market equilibrium not proof of fairness or efficiency in every dimension?
Check answer
It may ignore affordability, distribution, market power, rights, public goods, externalities, incomplete information, or discrimination
- 8. Name four factors besides worker productivity that can affect wages
Check answer
Bargaining power, unionization, minimum wage, monopsony, discrimination, occupational segregation, benefits, risk, location, labor law, immigration rules, and alternatives; any four
- 9. What is monopsony power in a labor market?
Check answer
Employer buying power created when workers have few realistic alternative employers, allowing the employer to influence wages or conditions downward
- 10. A team produces 40 units in 8 hours, then 56 units in 8 hours. Calculate output per hour before and after and the percent productivity increase
Check answer
Before: 5 units per hour; after: 7 units per hour; increase is 2 divided by 5, or 40 percent
- 11. Why might productivity rise without equal real-wage growth?
Check answer
Owners or managers may capture gains, market power may weaken bargaining, prices may rise, labor standards may lag, or measured output may reflect work intensification or unpaid inputs
- 12. Analyze a fictional labor market using product demand, labor supply, productivity, bargaining, legal rules, market power, discrimination, conditions, and distribution
Check answer
A complete response addresses all nine factors and treats workers as people within institutions rather than assuming wage equals personal worth