Well, let's be real the market will tolerate whatever it's given. But, yes close to 0% rates are optimal for fastest growth of economy. It should be remembered though that with 0% interest rates comes gross company valuations and wealth gaps. Along with it comes a more volatile market environment in general due to unnecessary risks of businesses.

Personally, I think that rates should be atleast the inflation rate. This means that 2% would be the bottom of rates. The 0% rates screwed us if you look at the economic reaction from a small virus.