Scene 1:VIRUS ECONOMICS
Here the most important thing you can do for the economy is slow the virus or show it has a lower bound. Pay sick not to work, buy ventilators, test/isolate. Nothing works until you get a handle on this.
Even if it rebounds soon, many businesses & ppl will not be able to survive the shock. Extensions on loans, food stamps, bankruptcy/foreclosure moratoria, money to stave off permanent collapse is key here.
Only AFTER 1 and 2 can you effectively get ppl spending again. Personally I favor cutting sales taxes here because it incentivizes actual spending rather than more savings if people remain fearful after virus wanes but any good bang-for-buck stuff here works.