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The Gini index,

also known as the Gini Coefficient, measures income or wealth inequality within a country or region.

If it’s zero, everybody has the same amount.

If it’s one, one person has all the wealth.

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Quick Summary: Wealth Inequality in the U.S.

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The History of Wealth Inequality in the United States

The Gilded Age and the Robber Barons

In the late 1800s, during the Gilded Age, a few powerful men—like Rockefeller, Carnegie, and J.P. Morgan—became extremely wealthy, while many workers lived in poverty.

👉 https://www.history.com/topics/19th-century/gilded-age

Trust Busting and Progressive Reforms

By the early 1900s, Americans pushed back. Presidents like Theodore Roosevelt used trust busting to break up monopolies. Workers fought for safer workplaces, shorter hours, and union rights—important protections for the working class.

👉 https://www.archives.gov/milestone-documents/sherman-anti-trust-act

The Great Depression & the New Deal

When the Great Depression hit in the 1930s, inequality made things worse. Franklin D. Roosevelt’s New Deal responded with programs like Social Security, public jobs, and stronger labor protections.

👉 https://www.fdrlibrary.org/great-depression-new-deal

The Great Compression (1940s–1970s): A Dip in Inequality

From the 1940s through the 1970s, inequality shrank. This is called the Great Compression. During these decades:

  • Unions were strong
  • Wages rose with productivity
  • The government invested in infrastructure, education, and public services
  • Taxes on the richest were high

Economists point to a dip in the Gini index at this time—inequality measured by that metric was lower than in many other periods. Middle-class families thrived.

👉 https://inequality.org/facts/income-inequality/

Erosion of Working-Class Protections

Starting in the 1970s, many protections began to slip away:

As these protections eroded, inequality began rising again.

The Trickle-Down Era (1980s–Present)

From the 1980s onward, “trickle-down economics” became dominant: big tax cuts for corporations and the rich, deregulation, and a belief that growth at the top would benefit everyone. In practice, much of the benefit stayed with the wealthy. Inequality rose sharply.

👉 https://www.imf.org/external/pubs/ft/sdn/2015/sdn1513.pdf

👉 https://wid.world

Conclusion: Ending Trickle-Down Would Free up a Whole Lot of Wealth

If the U.S. moved away from trickle-down policies and toward progressive taxation, stronger labor protections, and public investment, billions of dollars would be unlocked. Wealth currently concentrated at the top could instead fund:

  • Universal healthcare
  • Free higher education
  • Better public schools and universities
  • More affordable housing
  • Fighting climate change
  • Sustainable infrastructure

In effect, the country could reclaim some of the wealth that now sits unused at the top, making the economy work more fairly and broadly—much like what happened during the Great Compression.

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