https://en.wikipedia.org/wiki/Zero_interest-rate_policy

"Zero" Interest Rate Period, during the COVID pandemic, where most governments offered very cheap bonds or printed money to reduce interest rates. This caused a lot of investment as money was "cheap" for investors and needed to find a worthwhile investment in order to grow faster than inflation.

This caused a lot of money to be poured into all kinds of projects, not all of which had a positive return on investment.

Zero interest rate policy