Introduction

The Herfindahl-Hirschman Index (HHI) is a widely used measure in economics for analyzing the concentration of a market. It helps to determine the level of competition within an industry among its various participants. The HHI takes into account the size of firms and their respective shares of the market, offering a valuable insight for policymakers, businesses, and scholars. In this article, we will go over the process of calculating HHI step by step.

Step 1: Understand HHI concepts

The HHI is computed by squaring the market share of each firm operating in an industry and then summing up these squared figures. The end result ranges from close to zero (highly competitive market) to 10,000 (monopoly).

Below are some critical values you should be aware of:

– HHI < 1,500: Market concentration is considered low and represents healthy competition.

– 1,500 < HHI < 2,500: Moderate concentration in the market.

– HHI > 2,500: Indicates a highly concentrated market that can lead to anti-competitive behaviors.

Step 2: Gather required data

To calculate HHI for an industry, you’ll need to obtain data on the total market size and individual firm sales or the individual market shares of firms operating within that industry.

Step 3: Determine market shares for each firm

To compute individual firm’s market shares as percentages, divide each firm’s sales by the total sales for the whole industry. Depending on your data source, you may already have these figures.

Market Share (i) = (Firm Sales(i) / Total Industry Sales) x 100

Step 4: Square each firm’s market share

Next, square each firm’s market share determined in Step 3.

Squared Market Share (i) = Market Share (i) ^ 2

Step 5: Calculate HHI

Now, to calculate the HHI, sum up all the squared market shares obtained in Step 4.

HHI = Squared Market Share(1) + Squared Market Share(2) + … + Squared Market Share(n)

Conclusion

Calculating the Herfindahl-Hirschman Index is relatively simple and provides a valuable tool to analyze market concentration. By following the steps mentioned above, you can quickly determine the level of competition within an industry and make appropriate assessments and decisions for your business or policy interventions.