Compare Profit Margin across Different Sectors

In the article “Calculate Profit Margin”, we explained what is profit margin and why it is important to a company. We also used Caterpillar’s real net income statement to show how to calculate a company’s profit margin. Because profit margin is a ratio to measure a company’s profitability, we would like to know if different business sectors have different profit margin due to the nature of the business operation. In this article, we are going to compare profit margin across different sectors to see if profit margin difference exists or not.

Methodology

Sector Categorization

We categorize companies into nine sectors based on Yahoo Finance definition. The nine sectors are Basic Materials, Conglomerates, Consumer Goods, Financial, Healthcare, Industrial Goods, Services, Technology, and Utilities.

Company Selection

Among all tradable companies, we choose those that can be traded by options. The reason for that is because we would like to select companies that have certain liquidity. The company that can be traded by options means that they have certain liquidity. Currently there are 2825 companies that is option tradable.

Profit Margin Calculation

1. use Stock Financial Statements Download (SFSD) to batch download all target companies’ most recent net income statement
2. calculate each company’s profit margin ratio by formula: Net Income / Revenue
3. Compile the calculated company profit margin according to the sector it belongs to
4. use the median profit margin number of the specific sector to represent the sector’s profit margin
Note the median is used instead of average to avoid the distortion due to long tail distribution

Result

Following table is the calculation result

Sector	Sample Number	Median Profit Margin
Financial	521	0.17
Utilities	92	0.08
Technology	518	0.06
Industrial Goods	232	0.06
Basic Materials	357	0.06
Consumer Goods	253	0.05
Services	574	0.04
Healthcare	274	0.04
Conglomerates	4	0.035

There are several observations we can make from this table:
1. In this particular year (2012), financial sector has incredibly high profit margin compared to other sectors. We believe it has something to do with rebound from financial crises.
2. Exclude Financial sector, utilities sector has the highest profit margin, followed by technology, industrial goods, and basic materials sectors
3. Conglomerates sector has the lowest profit margin. However, it’s hard to make a conclusion because the sample is too small (only 4)

Further Analysis

We can further breakdown the data more into different industries inside each sector. Click here to download the raw data


From the breakdown table, we can see that there are some industries that could have high profit margin even though the sector they belong to has low profit margin. Take Cigarettes industry for example, it belongs to consumer goods sector, which has median profit margin 5%. However, this industry has median profit margin 25%.
We can plot the raw data to see the distribution:
It is obvious that even belongs to the same sector, profit margin across different industries can be huge different. Take consumer sector for example, cigarettes industry can have 25% profit margin, while farm products industry only has 1% profit margin

DuPont Equation and Its Implication

In the article “Calculate Profit Margin”, we mentioned that even though we prefer a company with high profit margin, it does not necessary mean this company has high return on equity. To the end, return on equity (ROE) is still one of the most important ratios to influence investment decisions. However, there is a relationship between ROE and profit margin. In this article, we are going to derive the relationship between ROE and profit margin (DuPont Equation) and explain how to use it to make investment decision.
 

ROE Decomposition

Return on Equity (ROE) is a ratio to measure the return on the shareholder’s equity. That’s the reason why it influences investment decision so much. The formula of ROE is simple:
ROE = Net Income / Average Shareholder’s Equity
Note here we use average shareholder’s equity instead of shareholder’s equity for calculation. It is because shareholder’s equity never constant during the fiscal period. It is better to use averaged shareholder’s equity during the fiscal period than the one at the end of fiscal period.
We can make first level decomposition of the above formula:
ROE = (Net Income / Average Total Assets) * (Average Total Assets / Average Shareholder’s Equity)
In the article “Calculate Financial Leverage”, we showed how to calculate financial leverage from debt-equity ratio. Because a company’s total assets = debt + equity,
=> Average Total Assets / Average Shareholder’s Equity = Financial Leverage
=> ROE = Return on Assets * Financial Leverage
We can further decompose return on assets (ROA):
ROA = Net Income / Average Total Assets
= (Net Income / Revenue) * (Revenue/Averaged Total Assets)
While Net Income / Revenue is profit margin and Revenue / Averaged Total Assets is
Asset turnover ratio
Now we derived the final format of DuPont equation:
ROE = ROA * Financial Leverage
= (Net Income/Revenue) * (Revenue/Averaged Total Assets) * (Averaged Total Assets/Averaged Shareholder’s Equity)
=> ROE = Profit Margin * Asset Turnover Ratio * Financial Leverage
 

Implication

From the formula above, it implies that we can always breakdown a company’s ROE into three elements: profit margin, asset turnover ratio, and financial leverage. By breaking down a company’s ROE into these three elements allows us to further investigate the main driver of a company’s ROE.
 

High Profit Margin as ROE Driver

Some industries tend to have high profit margin as their ROE driver. That means they tend to sell less units of product but each unit sold need to have high profit margin to have competitive edge
 

High Asset Turnover Ratio as ROE Driver

Some industries tend to have high asset turnover ratio as their ROE driver. That means they try to sell as many goods as possible in order to maintain proper ROE. Sudden drop of sales volume might hurt their ROE
 

High Financial Leverage as ROE Driver

Some industries tend to have high financial leverage as their ROE driver. That means they try to generate profit by borrowing other people’s money. However, high financial leverage accompanies high financial risk.