Thank you for the question. I can take the lead, and then Mr. Sabia can jump in if he wants to add.
The year-over-year change was roughly $25 billion. You're right: On the expense side, COVID-related expenses were in the range of $7 billion, directly related to the emergency response benefit. On the revenue side, however, there were two weeks in the year when there was a huge shock to revenue as the economy virtually shut down overnight. We estimate that even on the revenue side the shock was between $7 billion and $10 billion.
There was a lot going on on the revenue side. Mr. Lawrence, you're totally right: There was a slowing economy at the tail end of 2019; there was the COVID-related shock, as I said, which pretty much shut down the economy overnight; and then there were a number of government programs that really obscured revenue receipts, whereby the government provided tax deferrals on corporate taxes, personal income taxes and excise taxes.
Fundamentally, it was really hard to make sense of what was going on with tax receipt right at the tail end of the fiscal year and in the early part of the new fiscal year, just because you had so many interactions in play. We estimate, though, that the revenue shock alone was $7 billion to $10 billion.
Again, then, expense of $7 billion and revenue drop of $7 billion to $10 billion takes you to about $15 billion to $20 billion of COVID-related impacts upon the public accounts that you have in front of you.