Economic Foundations & Market Decisions — Chapter review · Government, Civic Participation & Economics, Grade 12
5 focused units, followed by an evidence workshop, chapter review, and chapter quiz.
Review the key ideas
Scarcity, Opportunity Cost & Decisions at the Margin
Opportunity cost is the value of the next-best alternative given up, rather than the sum of every imaginable alternative. A monetary price can represent part of a cost, while time, forgone income, or other consequences may matter too. Already irrecoverable spending is a sunk cost; the present choice should compare future feasible alternatives instead of trying to undo the past.
Supply, Demand, Equilibrium & Market Changes
In a simple competitive model, equilibrium occurs where quantity demanded equals quantity supplied. A shortage at a stated price means demand exceeds supply; a surplus means supply exceeds demand. These are quantities in a model, not a claim that every person’s needs are satisfied or that the allocation is fair.
Firms, Competition, Market Power & Profit
Competition depends on available alternatives, entry, information, and product differences. A price-taking model describes a firm unable to control the market price; market power concerns ability to influence price or terms. Monopoly concerns a single supplier in a defined relevant market, not simply any large company. Barriers and substitution require evidence.
Production, Entrepreneurship & Economic Institutions
An economic system concerns how decisions about production, allocation, and distribution are organized. Markets coordinate some choices through prices and exchange; public institutions, households, cooperatives, and other organizations also act. Actual arrangements mix mechanisms. One label does not establish every ownership rule, incentive, public service, or household outcome.
Externalities, Public Goods & Policy Responses
A public good in the economic sense is nonrival and nonexcludable under defined conditions: one person’s use does not diminish another’s, and exclusion is difficult. A common resource is rival but difficult to exclude from. A publicly funded service is not automatically a public good in this technical sense; a crowded classroom has capacity limits.
Problem 1
Answer and explanation
Twelve booklets require six hours and 16 posters require four, totaling ten hours. The plan is infeasible within eight hours under the stated rates. One booklet’s half-hour could produce two posters, so its opportunity cost is two posters. A revised allocation or an explicit capacity change is needed; a desire for both outputs does not remove the constraint.
Compute hours required for each product.
Add required time.
Label forgone output per booklet.
Response criteria
- Explain the relevant institution or economic concept accurately; show correct calculations where needed.
- Connect supplied evidence and stated assumptions to an explained conclusion.
- Compare feasible options and their effects on different people without stereotypes.
- Identify a limitation, tradeoff, uncertainty, or condition that qualifies the conclusion.
Problem 2
Answer and explanation
Limited time, materials, capacity, or other resources still have competing uses. A zero money price does not remove the alternative forgone or establish unlimited availability. Identify the scarce resource and feasible alternatives.
Problem 3
Answer and explanation
Originally, $3 and 40 units equate supply and demand. After the shift, demand at $3 is 80 while supply remains 40, a shortage of 40. At $4, both are 60, so the new listed equilibrium is $4 and 60 units. The prediction holds within this supplied model; it does not establish the cause of an actual market change or instant adjustment.
Find equality in the original schedule.
Add 40 to demand rows.
Compare quantities at $3 and $4.
Response criteria
- Explain the relevant institution or economic concept accurately; show correct calculations where needed.
- Connect supplied evidence and stated assumptions to an explained conclusion.
- Compare feasible options and their effects on different people without stereotypes.
- Identify a limitation, tradeoff, uncertainty, or condition that qualifies the conclusion.
Problem 4
Answer and explanation
Quantity demanded is 60 units and supplied is 20, so demand exceeds supply by 40 units per week at that price. It does not mean 40 additional units already exist or establish how an actual market would allocate the available 20.
Problem 5
Answer and explanation
Revenue is $500; accounting profit is $80; economic profit under the supplied definitions is $20. The calculation includes the $60 forgone income once. It does not establish cash-flow timing, future demand, or all social effects. If an opportunity cost were already in the cost measure, subtracting it again would be an error.
Multiply price by quantity.
Subtract stated accounting costs.
Subtract the additional opportunity cost once.
Response criteria
- Explain the relevant institution or economic concept accurately; show correct calculations where needed.
- Connect supplied evidence and stated assumptions to an explained conclusion.
- Compare feasible options and their effects on different people without stereotypes.
- Identify a limitation, tradeoff, uncertainty, or condition that qualifies the conclusion.
Problem 6
Answer and explanation
Economic analysis includes relevant opportunity costs that may not appear as accounting expenses. In the invented case, subtracting the additional $60 opportunity cost from $80 accounting profit leaves $20. Definitions must avoid double counting.
Problem 7
Answer and explanation
Productivity rises from four to five loaves per hour. The increase is one divided by four, or 25 percent. This establishes a rate change under consistent measures, not an equal wage increase or the isolated effect of one technology. Compensation, output quality, inputs, and implementation records would help explain the change and its distribution.
Divide output by labor hours.
Calculate the change relative to the original rate.
Distinguish productivity from compensation and causation.
Response criteria
- Explain the relevant institution or economic concept accurately; show correct calculations where needed.
- Connect supplied evidence and stated assumptions to an explained conclusion.
- Compare feasible options and their effects on different people without stereotypes.
- Identify a limitation, tradeoff, uncertainty, or condition that qualifies the conclusion.
Problem 8
Answer and explanation
Money or credit finances a transaction, while equipment directly supplies productive services. Distinguishing financial resources from produced tools explains the pathway from funding to capacity and prevents counting the same activity as two identical inputs.
Problem 9
Answer and explanation
Modeled social cost is $14 per unit. A $4 charge could make the measured external effect enter the producer’s decision under the assumptions. The packet lacks demand, damage variation, enforcement, and distributional evidence, so it cannot establish optimal output or universal effectiveness. It illustrates a mechanism rather than resolving a real policy dispute.
Add distinct costs.
Identify the incentive mechanism.
State missing information for broader conclusions.
Response criteria
- Explain the relevant institution or economic concept accurately; show correct calculations where needed.
- Connect supplied evidence and stated assumptions to an explained conclusion.
- Compare feasible options and their effects on different people without stereotypes.
- Identify a limitation, tradeoff, uncertainty, or condition that qualifies the conclusion.
Problem 10
Answer and explanation
An effect on people outside the exchange may not enter the buyer’s or seller’s decision. Under the supplied model, the $4 external harm raises social cost beyond the $10 private cost. Identify and measure the effect rather than assuming every price includes it.