Source: Federal Reserve Bank of St. Louis  

Release: Interest Rate Spreads

Units:  Percent, Not Seasonally Adjusted

Frequency:  Monthly

Series is calculated as the spread between Moody's Seasoned Aaa Corporate Bond© (https://fred.stlouisfed.org/series/AAA) and 10-Year Treasury Constant Maturity (BC_10YEAR).

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Starting with the update on June 21, 2019, the Treasury bond data used in calculating interest rate spreads is obtained directly from the U.S. Treasury Department.