Who bears the risk of unfunded government spending, taxpayers or bondholders?
Core argument: When governments and central banks insulate taxpayers rather than bondholders from spending shocks, bond yields rise as unfunded fiscal expansions mark government debt to market, shifting risk onto bondholders — a risky debt regime the authors find fits recent experience.
Governments and central banks can protect either taxpayers or bondholders from government spending shocks. When they choose to insulate taxpayers, government bond yields increase in response to unfunded fiscal expansions as the government debt is marked to market. The risks of unfunded spending shocks are then borne by bondholders. This risky debt regime is a better fit for recent experience. High-frequency evidence from the COVID episode links U.S. In Figure 12, the cumulative change in the Treasury portfolio valuation on large negative proposal days [in red] exhibits a smooth downward trend over the extended sample, implying that the effects are attributed to a consistent flow of fiscal news rather than a few large observations. Between March 2020 and March 2022, the effect is much larger, as shown by the significant steepening of the red line. During COVID the overall value changes shown by the blue line were primarily driven by fiscal news. [Finally], in this risky debt regime, large-scale asset purchases in response to large government spending provide temporary price support to government bonds, a net loss for taxpayers.



