ultra-low interest rates
Economic term referring to extremely low interest rates, often used in financial news and policy discussions.
The ultra-low interest rate policy boosted demand for home loans.
In an era of ultra-low interest rates, savings alone won't grow your assets.
低金利 means 'low interest rates' in general, while 超低金利 emphasizes an extreme, ultra-low level.
マイナス金利 refers specifically to negative interest rates, a subset of ultra-low rates where rates fall below zero.
ultra-loose monetary policy
Compound of 超 (chō, 'ultra-') + 低 (tei, 'low') + 金利 (kinri, 'interest rates'). A straightforward modern financial term.