Glass-Steagall.

In plain English

Passed in 1933, the Banking Act separated deposit taking and lending from securities underwriting and dealing, and it also created federal deposit insurance, before Congress removed the separation with the Gramm-Leach-Bliley Act. The original concern was that a bank underwriting securities had an incentive to push weak issues onto its own depositors and to lend against them. Over the decades regulators loosened the interpretation, so the formal repeal ratified a separation that had already eroded. After repeal, one holding company could own a commercial bank, a broker-dealer, and an insurance business. Debate about restoring some version of it has continued ever since.

01Why it matters

The structure decides whether the institution holding your checking account is also running an underwriting and trading business, which changes what risks sit next to your deposits.

02The math, step by step

Say a company wants to issue $500 million of bonds. Under the separation, an investment bank underwrites the deal and a commercial bank cannot. After repeal, one holding company can underwrite the bonds, lend the company $200 million, and sell the bonds to clients.

Illustrative example. The amounts here are hypothetical, chosen to show how the math works, not real quoted rates or figures.

03What this is NOT

04Receipts

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