The US has enough revenue to pay all bondholders, but a roughly $1.5 trillion deficit this year means that if the debt ceiling isn’t lifted, it won’t be able to pay all its obligations, maybe even entitlement payments under Medicare, Medicaid, or Social Security.

In spite of weakness in some economic data, problems in the banking sector, and much higher interest rates, real GDP in the first quarter will almost certainly show moderate growth. Meanwhile, the S&P 500 is 15% higher than its low point in October 2022. And, now,...