# Concept of the Firm

Business I · Economics of the Firm · https://tryals.app/learn/business-i/concept-of-the-firm

## What Is a Firm?

A **firm** is an organization that combines **production factors** (land, labor, capital) to transform inputs into goods and services worth more than the inputs.

$$\text{Value added} = \text{Revenue} - \text{Cost of intermediate inputs}$$

A bakery buying flour for 2€ and selling bread for 5€ creates 3€ of **value added**. **Value added** is not profit; wages, rent, and interest are paid from it, and profit is what remains.

Ronald **Coase** explained firms exist because markets have **transaction costs** (searching, negotiating, enforcing). Firms form when internal coordination is cheaper than market contracts.

| Coordination via | Cost that rises |
| --- | --- |
| Market contracts | Search, negotiation, enforcement |
| Internal authority | Bureaucracy, blurred incentives |

> **Common pitfall:** Assuming bigger is always better. The firm stops growing when internal bureaucracy catches up with market transaction costs.

## The Boundary of the Firm

A firm's boundary sits where internal costs equal market costs:

$$\text{Firm boundary: } MC_{\text{internal}}(\text{size}) = MC_{\text{market}}$$

The efficient firm expands **make** decisions until the marginal cost of making equals the marginal cost of **buying**.

| Signal | Make (inside) | Buy (market) |
| --- | --- | --- |
| Asset specificity | High, custom | Low, standardized |
| Contract complexity | Hard to enforce | Easy to price |
| Strategic value | Core value added | Generic support |

Activities with **high asset specificity** migrate inside the firm, while standardized ones stay in the market.

> **Common pitfall:** Outsourcing an activity just because it is cheap today, ignoring future dependence on your core value added.

## Practice questions

8 of this lesson's 13 practice questions, with answers. The full set is in the app.

### 1. Sort each item: is it an **intermediate input** the firm buys, or **value the firm adds**?

**Answer:**

- Intermediate input: Flour bought from the mill, Electricity from the grid, Packaging bought wholesale
- Value added by the firm: The baker’s kneading skill, The recipe perfected in-house, The brand customers trust

**Why:** Everything purchased from other firms is an intermediate input; skill, know-how, and reputation are how the firm transforms those inputs into something worth more.

Page: https://tryals.app/practice/business-i/concept-of-the-firm/sort-each-item-is-it-an-intermediate-input-the-firm-buys-or-value

### 2. Match each core role of the firm to its description.

**Answer:**

- Coordination → Directing production factors under one authority
- Value creation → Making output worth more than the inputs
- Risk-bearing → Paying factor incomes before revenue is known
- Innovation → Introducing new products and processes

**Why:** The firm replaces market haggling with managed coordination, and it earns its profit by bearing the risk that revenue may not cover committed costs.

Page: https://tryals.app/practice/business-i/concept-of-the-firm/match-each-core-role-of-the-firm-to-its-description

### 3. According to Coase, why does production happen inside firms instead of through individual market contracts for every task?

A. Firms can always produce at lower physical cost than individuals
B. Workers refuse to sell services without long-term employment
C. Using the market has transaction costs that internal coordination can avoid
D. Governments require production to be organized in firms

**Answer:** C. Using the market has transaction costs that internal coordination can avoid

**Why:** Coase (1937): firms exist because market exchange itself is costly. When internal coordination beats the transaction costs of contracting, the task moves inside the firm.

Page: https://tryals.app/practice/business-i/concept-of-the-firm/according-to-coase-why-does-production-happen-inside-firms-instead

### 4. A firm hires a cleaner on a permanent contract rather than calling a cleaning agency each week. Coase's theory predicts when that swap makes sense. What is the deciding quantity?

A. Whether the firm is large enough to justify a permanent headcount
B. Whether the transaction costs of contracting exceed internal management
C. Whether cleaning is part of the firm's core business
D. Whether the employee's wage is lower than the agency's weekly fee

**Answer:** B. Whether the transaction costs of contracting exceed internal management

**Why:** Using the market is never free, every contract must be found, priced, watched and enforced, and a firm is the decision to pay a manager instead. It answers the question Coase noticed nobody had asked: if markets allocate so well, why is the economy full of islands where they are switched off?

Page: https://tryals.app/practice/business-i/concept-of-the-firm/a-firm-hires-a-cleaner-on-a-permanent-contract-rather-than-calling-a

### 5. Which of the following are transaction costs of using the market?

A. The invoice price of the goods themselves
B. Lawyer fees for drafting the supply contract
C. Monitoring whether the contract is honored
D. Time spent searching for a reliable supplier

**Answer:** B. Lawyer fees for drafting the supply contract; C. Monitoring whether the contract is honored; D. Time spent searching for a reliable supplier

**Why:** Transaction costs are the costs of *arranging* exchange, search, negotiation, enforcement. The price of the goods is the exchange itself, not a cost of organizing it.

Page: https://tryals.app/practice/business-i/concept-of-the-firm/which-of-the-following-are-transaction-costs-of-using-the-market

### 6. Coase asked why firms exist at all if markets allocate efficiently. What does the existence of large firms tell us about markets?

A. That firms exist only where regulation prevents a market from forming
B. That using a market is not free: search, negotiation, enforcement
C. That markets allocate inefficiently and firms correct the errors
D. That production requires more capital than any individual can raise

**Answer:** B. That using a market is not free: search, negotiation, enforcement

**Why:** The boundary of the firm sits where the two costs balance. Falling transaction costs — better contracts, better search — push work back out to the market, which is exactly what outsourcing and gig platforms are.

Page: https://tryals.app/practice/business-i/concept-of-the-firm/coase-asked-why-firms-exist-at-all-if-markets-allocate-efficiently

### 7. A firm’s value added equals its total revenue.

**Answer:** False

**Why:** Value added is revenue **minus** the intermediate inputs bought from other firms. Counting full revenue would double-count the mill’s flour inside the bakery’s bread.

Page: https://tryals.app/practice/business-i/concept-of-the-firm/a-firms-value-added-equals-its-total-revenue

### 8. A workshop buys raw steel for 3,000€, other materials for 1,200€, and sells its finished gates for 9,500€. Compute its value added in euros.

**Answer:** 5300 (within ±0.5)

**Why:** Value added $= 9500 - (3000 + 1200) = 5300$€, the pool from which wages, rent, interest, and profit are all paid.

Page: https://tryals.app/practice/business-i/concept-of-the-firm/a-workshop-buys-raw-steel-for-3-000-other-materials-for-1-200-and