Valuation and Growth Ratios

TL;DR

Valuation and growth ratios help you understand how a company's stock price relates to its earnings and how fast it's expanding. These ratios are crucial for deciding if a stock is a good value and if the company is growing sustainably. They give you a snapshot of investor sentiment and future potential.

1. The Mental Model

Think of valuation ratios as comparing the price you pay for a slice of pizza to the value of its ingredients and how many people want it. Growth ratios are about how quickly the pizza shop is making more pizza or expanding to new locations.

2. The Core Material

Valuation and growth ratios are key tools for evaluating a company's financial health and market perception. You'll use these to decide if a stock is overpriced, underpriced, or growing at an attractive rate.

Price-to-Earnings (P/E) Ratio

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The P/E ratio tells you how much investors are willing to pay for each dollar of a company's earnings. A high P/E might mean investors expect high future growth, while a low P/E could suggest a company is undervalued or has slow growth prospects.

Formula: P/E Ratio = Market Price Per Share / Earnings Per Share (EPS)

• EPS (Earnings Per Share): This is the company's net profit divided by the number of outstanding shares. It tells you how much profit the company makes for each share of stock.

Price/Earnings-to-Growth (PEG) Ratio

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The PEG ratio refines the P/E by considering the company's expected earnings growth rate. It helps you see if a high P/E is justified by high growth. A PEG ratio around 1 is often considered "fairly valued."

Formula: PEG Ratio = (P/E Ratio) / (Annual EPS Growth Rate)
* Annual EPS Growth Rate: This is usually expressed as a percentage, so you'll divide it by 100 in the formula (e.g., 15% growth becomes 0.15).

Price-to-Book (P/B) Ratio

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The P/B ratio compares a company's market value to its book value. Book value is essentially the value of a company's assets minus its liabilities. A P/B less than 1 might indicate an undervalued company, but it could also mean the market doubts its assets' quality.

Formula: P/B Ratio = Market Price Per Share / Book Value Per Share

• Book Value Per Share: This is calculated as (Total Shareholder Equity) / (Number of Outstanding Shares).

Price-to-Sales (P/S) Ratio

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The P/S ratio is useful for companies that aren't yet profitable (so P/E isn't applicable) or for comparing companies in the same industry. It tells you how much investors are willing to pay for each dollar of a company's sales.

Formula: P/S Ratio = Market Price Per Share / Sales Per Share

• Sales Per Share: This is calculated as (Total Revenue) / (Number of Outstanding Shares).

Revenue Growth Rate

This ratio measures how fast a company's sales are increasing over a period. Strong, consistent revenue growth is a positive sign for a company's future.

Formula: Revenue Growth Rate = ((Current Period Revenue - Prior Period Revenue) / Prior Period Revenue) * 100%

Earnings Per Share (EPS) Growth Rate

This measures the rate at which a company's earnings per share are growing. It's a key indicator of profitability growth and often drives stock price appreciation.

Formula: EPS Growth Rate = ((Current Period EPS - Prior Period EPS) / Prior Period EPS) * 100%

Here's how these ratios relate to a company's journey:

graph TD
    A["Company Starts Selling"] --> B["Generates Revenue"];
    B --> C["Revenue Growth Rate"];
    C --> D{"Is Company Profitable?"};
    D -- "Yes" --> E["Generates Earnings"];
    E --> F["EPS Growth Rate"];
    E --> G["Market Price Per Share"];
    F --> H["PEG Ratio (Valuation)"];
    G --> I["P/E Ratio (Valuation)"];
    G --> J["P/S Ratio (Valuation)"];
    G --> K["P/B Ratio (Valuation)"];
    D -- "No (Early Stage / High Investment)" --> J;
    J --> MarketSentiment;
    I --> MarketSentiment;
    H --> MarketSentiment;
    K --> MarketSentiment;
    MarketSentiment["Investor Expectations & Valuation"];

3. Worked Example

Let's analyze a hypothetical company, "GrowCo."

GrowCo's Financial Data:
* Market Price Per Share: \$50
* Earnings Per Share (EPS) - Current Year: \$2.50
* Earnings Per Share (EPS) - Prior Year: \$2.00
* Book Value Per Share: \$25
* Sales Per Share: \$10
* Expected Annual EPS Growth Rate: 20% (or 0.20)

Calculations:

1. P/E Ratio: \$50 / \$2.50 = 20x

   • Interpretation: Investors are willing to pay 20 times GrowCo's current annual earnings.

2. EPS Growth Rate: ((\$2.50 - \$2.00) / \$2.00) * 100% = (\$0.50 / \$2.00) * 100% = 25%

   • Interpretation: GrowCo's earnings per share grew by 25% from the prior year.

3. PEG Ratio: 20 / 20 (using 20% as 20, not 0.20, for common practice) = 1.0x

   • Interpretation: A PEG of 1.0 suggests GrowCo is fairly valued relative to its expected growth. If we used the EPS Growth Rate (25%), it would be 20 / 25 = 0.8, which might indicate it's slightly undervalued relative to its historical growth. It's crucial to be consistent with the growth rate source (analyst estimates for PEG, historical for EPS growth).

4. P/B Ratio: \$50 / \$25 = 2.0x

   • Interpretation: GrowCo's market value is twice its book value. This is common for companies with strong brands or intellectual property not fully captured by book value.

5. P/S Ratio: \$50 / \$10 = 5.0x

   • Interpretation: Investors are paying \$5 for every dollar of GrowCo's sales. You'd compare this to industry peers to see if it's high or low.

4. Key Takeaways

• Valuation ratios (P/E, PEG, P/B, P/S) help you assess if a stock's price is reasonable compared to its earnings, assets, sales, and growth.
• Growth ratios (Revenue Growth, EPS Growth) tell you how quickly a company is expanding its top line (sales) and bottom line (profit).
• Always compare these ratios to industry averages, historical data for the company, and competitors to get meaningful insights.
• A high P/E ratio isn't necessarily bad if it's justified by a high expected growth rate (check the PEG ratio).
• P/S and P/B ratios are especially useful for companies with inconsistent earnings or those in capital-intensive industries.
• Understanding the context behind the numbers is as important as the numbers themselves.

Common Mistakes to Avoid:
- Comparing a P/E ratio of a tech startup to that of a mature utility company without considering industry differences.
- Assuming a low P/E always means "undervalued" without looking at reasons like declining growth or high debt.
- Using a future growth rate for the PEG ratio that isn't realistic or isn't from a credible source.
- Relying on just one ratio for your investment decision; a holistic view is always best.

5. Now Try It

Pick two companies from the same industry (e.g., two large tech companies or two retail chains). Find their current stock prices, recent EPS, total revenue, and shareholder equity from their financial statements (you can often find this on finance websites like Yahoo Finance or Google Finance).

Calculate the P/E, P/B, and P/S ratios for both companies. Then, calculate their 1-year EPS growth rate. Compare these ratios for the two companies. Write a short paragraph explaining which company you think offers better value based on your calculations and why. Your success will be measured by your ability to correctly calculate the ratios and provide a logical, comparative interpretation.