Case-Shiller Home Price Index

What Is the Case-Shiller Home Price Index?

The Case-Shiller Home Price Index is a widely followed repeat-sales index that tracks changes in U.S. home prices over time. It is one of the most recognized benchmarks for measuring residential real-estate price trends.

The index is often used by investors, economists, and the financial media to discuss whether home prices are rising, flattening, or falling across major U.S. markets.

Key Takeaways

• The Case-Shiller index tracks home-price changes using a repeat-sales methodology.
• It is designed to measure price movement more consistently than a simple median sale price.
• The index has national, 10-city, and 20-city versions.
• It is one of the best-known U.S. housing-price benchmarks.
• It is often discussed alongside the broader idea of a home price index.

How the Case-Shiller Index Works

The Case-Shiller framework compares repeat sales of the same properties over time. That approach is designed to reduce distortion from changes in the mix of homes sold. Instead of asking whether this month's typical house was more expensive than last month's typical house, the method tries to estimate how much the value of comparable homes changed over time.

That makes the index useful for identifying broad trends in residential prices rather than just summarizing one month's mix of transactions.

How the Case-Shiller Index Frames Housing Trends

Home prices affect household wealth, equity positions, refinancing behavior, affordability, and financial-system risk. When home prices accelerate, affordability often deteriorates for buyers even as current owners gain paper wealth. When prices weaken, borrower behavior and lender risk can change too.

The index is often used in discussions about housing cycles, household balance sheets, and broader macro conditions.

Case-Shiller Versus Median Home Price

The two measures answer different questions. One is built for trend measurement. The other is built for simple market snapshots.

The Bottom Line

The Case-Shiller Home Price Index is a repeat-sales benchmark used to track U.S. home-price trends over time. It provides one of the clearest widely recognized measures of whether residential real-estate values are strengthening or weakening.