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MarketWatch Top Storiesmarkets

Here’s what’s necessary to return the incredibly concentrated U.S. stock market to normal levels

MarketWatch Top Stories
Thursday, February 26, 2026 at 10:22 AM
~4 min read
Equities

Original Report

D.E. Shaw, the renowned number-crunching hedge fund manager, calculated how long it would take for concentrated U.S. stock markets to return to normal.

Glass House Analysis

This story reflects the interconnected nature of modern economic systems, where developments in one sector inevitably affect others. Understanding these connections is essential for grasping how policy decisions and market movements translate into real-world outcomes for families, workers, and communities. The economy is not an abstract system of numbers—it's the sum total of decisions about who works, who prospers, and who struggles.

The implications extend beyond the immediate news cycle. Every economic development creates ripples that affect employment, prices, and opportunities in ways that may not be immediately visible but are deeply felt. By tracking these connections, we can better understand how the economy truly works—not as an abstract machine, but as a human system shaped by and shaping the lives of millions.

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Economic Context

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