Regulators are seeking to impose further restrictions on the ability of Wall Street banks to make risky investments with their own money.
If the new rules proceed, banks will be prohibited from buying and selling commodities, like copper, and would have to shut down what remains of their in-house private equity operations.
The biggest banks have already been scaling back these businesses, but Goldman Sachs continues to have significant operations in these areas.
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Most of the recommendations are unlikely to take effect soon because they would need to be passed by Congress. But the Office of the Comptroller of the Currency is moving to immediately prohibit banks from buying and selling copper.
The proposed rules were in a long-awaited report released Thursday from the three largest banking regulatory agencies: the Federal Reserve, the Office of the Comptroller of the Currency and the Federal Deposit Insurance Corporation.