Yield Curve

The spreads show various differences between bond yields at different maturities. If these invert below 0, it can signal a recession.

Level represents the parallel movement of all yields, slope represents the movement of long-term yields in relation to short-term yields, and curvature represents the movement of mid-term yields in relation to the short and long term yields. See the documentation for more information on how these relate to interest rates / inflation.