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Proprietary Trading and the Volcker Rule

Wall Street Mechanics — The Insider Curriculum • Beginner Investing • 7 min

What this lesson is about

Trading with the bank's own money versus trading on behalf of clients used to be a much blurrier line, until a 2010 law, named after a familiar figure from this platform's Fed content, drew it sharply.

2 parts · a quick check after each · then the quiz

Part 1 of 2

Before 2010, the line between a bank trading for clients and one trading purely for its own profit was much blurrier than it is today. Proprietary trading, or "prop trading," refers specifically to the second category: a bank using its own capital to make a profit for itself. This is different from facilitating client trades or providing market-making liquidity, which we’ll cover elsewhere in this module.

The Volcker Rule is part of the 2010 Dodd-Frank Wall Street Reform Act. It generally restricts banks from engaging in proprietary trading and limits their ownership and sponsorship of certain hedge funds and private equity funds. It’s named after Paul Volcker, the Fed Chair from 1979 to 1981. He’s known for his dramatic interest rate hikes aimed at breaking runaway inflation in the 1970s. Decades later, he proposed this reform after the 2008 financial crisis. The underlying concern is that banks taking large, speculative trading risks with their own capital. Capital backed partly by federal deposit insurance and government support. Could create outsized risks to the financial system. If those bets go wrong, taxpayers could end up exposed.

What borrowing does to both endsThe same multiple on the way up and the way down.

Quick check

What is "proprietary trading" (often called "prop trading")?

Part 2 of 2

Insider Angle: Implementing the Volcker Rule has been genuinely difficult. This isn’t just an abstract technicality; it’s a well-documented regulatory challenge. The core problem? Legitimate market making (covered in this module's dedicated lesson) can look very similar to prohibited proprietary trading. Both involve a bank actively buying and selling securities using its own balance sheet. A market maker holding inventory while facilitating client orders can resemble a prop trader making a speculative bet. The real distinction lies in intent, the client-facing purpose, and the specific regulatory tests. These tests, like limits on how much risk a position can carry relative to anticipated client demand, have created ongoing regulatory complexity and periodic revisions since the rule was first implemented.
Try This: Research the specific criteria regulators use to distinguish permitted market-making activity from prohibited proprietary trading under the Volcker Rule. What specific factors or tests are involved in making that distinction in practice?

Quick check

What is the Volcker Rule?

Quiz

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