The relationship between interest rates and their volatility has been studied, showing that as rates change, so does their volatility. This relationship holds true even in times of negative rates. The researchers found that there are two distinct patterns in how real interest rates fluctuate based on their levels, and that high inflation tends to coincide with high real rates. Additionally, the volatility of interest rates also follows a predictable pattern, with higher volatility linked to higher rates. This information can help us understand how interest rates behave in different economic environments.