Introduction to Supply, Demand, and Gains from Trade in Economics

What is the definition of a competitive market?

A market where prices are used to allocate goods and every agent is a price taker.

What are transaction costs?

Anything that adds cost to trade, such as bargaining time, searching costs, and uncertainty over quality.

What is a price setting market?

A market that uses money as a medium of exchange to set prices for goods.

What is the role of money in a price setting market?

Money serves as a medium of exchange and a store of value.

What does it mean for an agent to be a price taker?

An agent behaves as if they have no control or effect on prices.

What is a competitive equilibrium?

An allocation and set of prices where every consumer and firm maximizes their payoff and total production equals total consumption.

What are the decision makers in a price setting competitive market?

Consumers and firms (producers).

What is the Law of Demand?

Demand is downward sloping; when the price increases, the quantity demanded decreases.

What is a demand curve?

A graph that shows how much quantity of a good is consumed at various prices, holding everything else constant.

What happens when there is a shift in demand?

A new demand curve is generated due to changes in factors other than the price of the good.

What are characteristics of a competitive market?

Many buyers and sellers, price transparency, low transaction costs, and free entry/exit.

What is a consumption bundle?

A combination of goods a consumer chooses to purchase.

What is a budget set?

The set of bundles a consumer can afford given their income and the prices of goods.

What is the significance of specialization in production?

It can strictly increase total output, allowing for more trade and better outcomes for agents.

What is the impact of high transaction costs in a market?

They can hinder trade and prevent the establishment of a competitive market.

What is the relationship between supply and demand in a competitive equilibrium?

Total production equals total consumption.

What is the effect of price transparency in a competitive market?

It allows agents to act as price takers and facilitates efficient trading.

What distinguishes non-competitive markets from competitive markets?

In non-competitive markets, agents are not price takers, often due to monopolies or oligopolies.

What is the role of preferences in consumer choice?

Preferences determine which consumption bundles provide higher utility to consumers.

How does a price setting market reduce transaction costs?

By providing a clear mechanism for exchange and allocation of goods.

What is the importance of the model of consumer choice?

It helps understand how consumers make decisions based on their preferences and budget constraints.

What is the significance of the price of goods in a demand curve?

The price is the only variable that changes along the demand curve, affecting the quantity demanded.

What is the impact of free entry and exit in a competitive market?

It encourages competition and helps maintain low prices.

What is the function of a price in a market?

It is the amount of money required in exchange for a good.

What does it mean for a market to be efficient?

Resources are allocated in a way that maximizes total surplus in the market.

What is the relationship between consumer payoffs and producer payoffs in a competitive market?

Both consumers and producers aim to maximize their respective payoffs.

What does D(p) = 12 - 2p represent?

A demand function where D(p) is the quantity demanded at price p.

What is the significance of the price being non-negative in demand models?

It allows for any non-negative amount to be purchased by consumers.

What are some variables that can cause shifts in demand?

Income, prices of related goods, preferences, expectations, and number of buyers.

What happens to the demand curve if demand increases at every price?

The demand curve shifts to the right.

What happens to the demand curve if demand decreases at every price?

The demand curve shifts to the left.

How is the Market Demand Curve defined?

It is the sum of individual demand curves of all consumers.

What is the Market Demand for two consumers with demand curves DA(p) = 12 - 2p and DB(p) = 7 - p?

D(p) = 19 - 3p for 0 ≤ p ≤ 6, D(p) = 7 - p for 6 < p < 7, and D(p) = 0 for p ≥ 7.

What defines two goods as substitutes?

An increase in the price of one leads to an increase in the demand for the other.

What defines two goods as complements?

An increase in the price of one leads to a decrease in the demand for the other.

What is a normal good?

A good for which an increase in income causes an increase in demand.

What is an inferior good?

A good for which an increase in income causes a decrease in demand.

How do preferences affect demand?

Changes in consumer preferences can lead to shifts in demand.

What is the role of expectations in demand?

Expectations about future events can influence current demand.

What is the quantity supplied in a price-setting market?

The amount of a good a producer chooses to create to maximize profit.

What is the definition of a firm?

An organization that takes inputs and converts them into outputs.

What is total revenue?

The money collected from the sale of goods, denoted as R(q).

What is the cost of production?

The expenditure on creating the output quantity, denoted as C(q).

How is profit calculated?

Profit is total revenue minus total cost, denoted as π(q) = R(q) - C(q).

What determines a firm's cost function C(q)?

The lowest cost way to produce q units of output given technology and input prices.

What is marginal revenue?

The amount that revenue increases with the next unit of production.

What is marginal cost?

The amount that cost increases with the next unit of production.

When is profit maximized in production?

When marginal revenue equals marginal cost.

What is the relationship between price and marginal revenue for a price taker?

Marginal revenue equals the price.

When is profit maximized for a firm?

Profit is maximized when price equals marginal cost.

What does a supply curve represent?

A supply curve is a function that gives the profit-maximizing quantity produced for any price.

What happens to the supply curve when the price of a good changes?

The supply curve remains the same, and we say we 'move along' the supply curve.

What causes a shift in the supply curve?

Changes in input costs, technology, expectations about the future, or the number of sellers.

What does a rightward shift in the supply curve indicate?

It indicates an increase in supply at every price.

What does a leftward shift in the supply curve indicate?

It indicates a decrease in supply at every price.

What is the Market Supply Curve?

The Market Supply Curve is the sum of individual supply curves.

How do input costs affect supply?

When input costs increase, supply decreases, shifting the curve to the left.

How does technology affect supply?

Advancements in technology can increase supply, shifting the curve to the right.

What is a surplus in market terms?

A surplus occurs when supply exceeds demand at the current price.

What is a shortage in market terms?

A shortage occurs when demand exceeds supply at the current price.

What happens to prices during a surplus?

There is downward pressure on prices as producers compete to sell their goods.

What happens to prices during a shortage?

There is upward pressure on prices as consumers compete to purchase available goods.

What is the effect of a right shift in demand on equilibrium?

It results in a higher equilibrium price and higher equilibrium quantity sold.

What is the effect of a left shift in supply on equilibrium?

It results in a higher equilibrium price and lower equilibrium quantity sold.

What happens when both supply and demand shift?

The equilibrium price will change, but the effect on equilibrium quantity is uncertain.

What is the formula for individual supply curves in the example provided?

SA(p) = p - 1 and SB(p) = p.

What is the competitive equilibrium price in the example given?

The competitive equilibrium price is p = 4.

What is the quantity at competitive equilibrium in the example given?

The quantity at competitive equilibrium is q = 7.

What does it mean for trade to be voluntary in a market?

No one can force an agent to buy or sell at any price.

What is the implication of agents being price takers?

The market sets the price, and agents act based on that price.

What occurs when the market is not at equilibrium?

The market tends to adjust quickly back toward equilibrium.

What is the impact of expectations about future prices on current supply?

Expectations of higher future prices may decrease current supply.

What does a piecewise supply function indicate?

It indicates different supply behaviors at different price ranges.

What are the three components of economic models?

1. Decision makers, 2. Decisions (choices) they can make, 3. Payoffs as a result of the choices.

What does a Production Possibilities Frontier (PPF) represent?

The set of all feasible combinations of output that an economy can produce.

When is production considered efficient on the PPF?

When we cannot produce more of one good without reducing production of another.

What do points on the frontier of the PPF indicate?

They are efficient points where we cannot produce more of one good without giving anything up.

What do points inside the PPF represent?

Inefficient production where more of at least one good can be produced without sacrificing another.

What does it mean if a point is outside the PPF?

It is not feasible due to lack of technology or resources.

How is opportunity cost defined in the context of the PPF?

The allocation that could have been realized otherwise.

Why is the PPF bowed outward?

It indicates that the opportunity cost of producing one good increases as more of that good is produced.

What can cause a shift in the PPF?

A technological advance.

What is trade in economic terms?

The exchange of goods and services.

Why is trade beneficial even if one can produce everything needed?

Trade allows economies to produce strictly more than they would otherwise, expanding the PPF.

What is an absolute advantage?

The ability to produce a good using fewer inputs than another producer.

What is a comparative advantage?

The ability to produce a good at a lower opportunity cost than another producer.

What happens when an agent specializes in production?

They devote more resources to the production of one good relative to another.

What is the principle of comparative advantage?

More output can be produced if each good is produced by the agent with the smaller opportunity cost.

What is a trade equilibrium?

A situation where there are no more gains from trade.

What are gains from trade?

The value created through trade.

Can one agent have a comparative advantage in both goods?

No, one agent cannot have a comparative advantage in both goods.

What must the equilibrium trade rate lie between?

The two opportunity costs.

What is a potential limitation of the simple trade model?

It does not show how society reaches an equilibrium allocation or consider the relative values of different goods.

What is the opportunity cost of producing 1 apple for agent A?

2 bananas.

What is the opportunity cost of producing 1 apple for agent B?

4 bananas.

If agent B specializes in bananas, how many bananas can they produce in 8 hours?

32 bananas.

What is the total production of apples and bananas in the economy if both agents specialize?

Greater than the production without specialization.

What does the PPF allow us to visualize?

Trade-offs and opportunity costs.

What is a potential drawback of the PPF model?

It may be too simple to look at two goods in isolation.