Not often. Actually there is an interesting distinction here between frequency and probability... but anyway there has recently been a ZIRP induced bubble (~200

Not often. Actually there is an interesting distinction here between frequency and probability... but anyway there has recently been a ZIRP induced bubble (~2008-2016), which leads to high prices of various assets in a trickle down way: https://fred.stlouisfed.org/series/FEDFUNDS https://fred.stlouisfed.org/series/FEDFUNDS