The JET Index is a composite measurement tool combining three financial market valuation indicators: the 2–10 Yield Curve Spread, Shiller PE, and Excess CAPE Yield. Each indicator receives a tier ranking from S (attractive) to F (unattractive), representing market conditions ranging from exceptional buying opportunities to dire situations.
The index was developed to cut through market noise and conflicting expert opinions. It addresses three key questions: market expense levels (Shiller PE), price attractiveness relative to risk-free investments (Excess CAPE Yield), and bond market dynamics (Treasury spread).
What it shouldn't do: The JET Index is explicitly not designed for market timing. Historical data shows comparable average returns (13–17%) across most tiers, with notable losses only in F Tier conditions.
What it should do: It helps contextualize emotional market reactions and identifies genuinely unique valuation positions. Users can then adjust personal portfolio risk levels accordingly based on their circumstances and objectives.
The guidance emphasizes consistent market participation through regular investment and reinvestment, with portfolio adjustments reflecting individual risk tolerance rather than index movements — except potentially during F Tier periods.