datoid

The 10-year Treasury yield jumped to 8.20% on January 16, 1990, marking a 4.0 standard deviation spike above its 60-day average of 7.89%. This represents an extreme statistical outlier with less than 0.01% probability. The surge occurred amid record-low unemployment at 4.30% and rising inflation (CPI up 1.8% over 3 months), suggesting bond markets were pricing in aggressive Fed tightening to combat overheating. GDP growth of 1.4% quarterly supports this economic backdrop. What's striking is how rapidly yields climbed from 7.77% in mid-December to this peak - a 43 basis point move in just one month during a critical economic inflection point.