Governments around the world have spent unprecedented sums — trillions of dollars — to combat the economic impacts of coronavirus. In the United States alone, the national deficit surpassed $3 trillion this year. That’s three times larger than in 2019 and some $2 trillion more than the White House projected back in February. But just what does rising government debt mean for our future? A new crop of economists – adherents to Modern Monetary Theory – have a bold proposition: Don't worry about it. In a modern economy, they argue, deficits are no bogeyman.