How do projected deficits affect Treasury valuations and long-term yields?
Core argument: CBO cost releases with large negative cash flow projections lowered the valuation of all outstanding U.S. Treasurys by more than 20% between 1997 and 2022, with effects concentrated at longer maturities.
The CBO cost releases of U.S. spending and tax [legislative] proposals contain valuable news about future primary surpluses priced in by U.S. Treasury investors. Using daily event windows, we find that cost releases with large negative cash flow projections have lowered the valuation of all outstanding Treasurys by more than 20% between 1997 and 2022. The valuation effects are concentrated at longer maturities, with an overall increase of 4% in long-term nominal yields driven by an increase in nominal term premia and inflation expectations and a decrease in convenience yields. We account for these valuation effects in a model with Bayesian [rationally updating] bond investors who use the cost releases to learn about the long-run dynamics of U.S. deficits. Using the estimated model, we infer that 57 cents of every dollar in the fiscal expansion is unbacked and passed through to Treasury valuations. Our estimates imply that a one percentage point surprise increase in the expected supply of Treasurys, expressed as a fraction of GDP, corresponds to an increase of the 10-year nominal yield by 31 bps and a drop in the convenience yield of 7.5 bps.



