Grade 11 Economics: Chapter 1- Lesson 2.2.1

What is the correct sequence of market structures from most competitive to least competitive?

1. Perfect competition

2. Monopolistic competition

3. Oligopoly

4. Pure monopoly

What are the basic characteristics of a Perfect Competition market structure?

Barriers: No entry or exit barriers

Product: Homogeneous (identical)

Sellers/Buyers: Many sellers and many buyers

Price: Uniform price; firms are price takers

Why is an individual firm in a perfectly competitive market considered a price taker?

The firm is insignificant compared to the overall market size, and its product is identical to everyone else's. Therefore, it cannot influence the price and must accept the price determined by the market.

How is the price of goods and services determined in a perfectly competitive industry?

By the total market forces of demand and supply (the interaction of all consumers and producers combined).

What is the shape of the demand curve facing a single, perfectly competitive firm, and what does it mean?

It is horizontal (perfectly elastic). This means the firm can sell any quantity ($Q$) of goods it wants at the fixed market price.

What unique equality connects price, demand, and revenue for an individual firm in perfect competition?

$$P = AR = DD = MR$$

(Price = Average Revenue = Demand = Marginal Revenue)

Why is the Total Revenue ($TR$) curve for a perfectly competitive firm a straight, upward-sloping diagonal line?

Because the firm is a price taker. The price ($P$) remains constant for every unit sold, meaning total revenue increases at a perfectly constant rate as quantity increases.

What are the formulas for Total Revenue ($TR$), Average Revenue ($AR$), and Marginal Revenue ($MR$)?

$$TR = P \times Q$$

$$AR = \frac{TR}{Q} = P$$

$$MR = \frac{\Delta TR}{\Delta Q} \text{ (Change in TR / Change in Q)}$$

What typical shape does the Average Total Cost ($ATC$) curve have as output increases?

It has a U-shape. This means $ATC$ falls at first as output increases, hits a minimum point, and then begins to rise.

What is the relationship between Marginal Cost ($MC$) and Average Cost ($AC$) when Average Cost is declining?

Marginal Cost is less than Average Cost ($MC < AC$).

What is the relationship between Marginal Cost ($MC$) and Average Cost ($AC$) when Average Cost is increasing?

Marginal Cost is greater than Average Cost ($MC > AC$).

At what specific point does the Marginal Cost ($MC$) curve equal the Average Cost ($AC$) curve?

When Average Cost is at its minimum point (where it stays the same).

What two baseline formulas can be used to calculate a firm's Profit?

$\text{Profit} = \text{Total Revenue } (TR) - \text{Total Cost } (TC)$ $\text{Profit} = (\text{Price} \times \text{Quantity}) - (\text{Average Cost} \times \text{Quantity})$

In economics, what is the core difference between the short run and the long run?

Short Run: A period where the quantity of at least one input is fixed while others can change.

Long Run: A period where the quantities of all inputs can be varied. (Note: There is no fixed calendar time that separates them; it varies by industry).