How much would it cost to guarantee debt for all publicly traded US corporations?

Estimated marked-to-market values of guaranteeing debt ex ante for all available publicly traded US corporations from Q4 1971 to Q4 2022 reveal that the largest estimates periodically arise with a handful of large financial corporations, but significant estimates can arise for nonfinancial corporations. In real Q1 2010 US dollars, the aggregate cost of guaranteeing debt reached $983 billion in Q1 2009 and $284.78 billion in Q1 2020 during the COVID-19 pandemic. Large observed guarantee estimates may reflect moral hazard, but also concerns about avoiding substantial increases in unemployment or maintaining the provision of essential services during national emergencies.