"Success to me would be if we could get back to pre-pandemic levels of unemployment and see the re-employment of those who have lost jobs in the service sector, particularly - I would also consider them a measure of success." Yellen said that if the federal government fails to spend the money necessary to get the economy quickly back on track, that will take a toll on US fiscal soundness, citing the long, slow recovery from the 2008-2009 financial crisis.
"So by having a stronger economy, the money that's spent partially pays for itself," Yellen said.
She said traditional metrics in assessing debt, such as the 100% U.S. debt-to-GDP ratio, are less relevant in a very low interest rate environment.