Most traders treat rising bond yields as an automatic sell signal for equities. That framing is too simple. Historically, the relationship between yields and stock prices depends entirely on why yields are rising — demand-driven growth economies have seen yields and equities climb simultaneously for extended periods, particularly in early-cycle recoveries.

The mechanism that actually causes damage is the discount rate effect. When the risk-free rate rises sharply, future earnings streams are discounted more aggressively. Growth stocks — whose valuations rely heavily on earnings projected years out — tend to compress faster than value stocks in these environments. The spread matters more than the absolute yield level.

CONCEPTYields rising on growth expectations behave very differently to yields rising on inflation fear — the equity impact is opposite.
WARNINGWhen 10-year yields breach key resistance levels rapidly, growth stock multiples historically compress within weeks — not months.
KEY IDEAThe equity risk premium — the gap between earnings yield and bond yield — is the real signal traders should be watching.

A practical framework traders use is the equity risk premium (ERP). Take the S&P 500 earnings yield (inverse of P/E) and subtract the prevailing 10-year Treasury yield. Historically, when this spread compresses below 1.5%, equities have faced significant valuation headwinds. When yields spike faster than earnings estimates rise, the ERP collapses — and that compression is where the real risk concentrates.

Danger Zone Yield ERP Level (%) Time → Bond Yield vs Equity Risk Premium

Traders who monitor the ERP alongside sector rotation patterns have a structural edge. Historically, when yields rise rapidly, defensives and financials have held relative strength while long-duration tech sold off. Understanding the mechanics behind bond yield dynamics and the concept of equity risk premium gives traders a lens beyond price action. The broader context of how bond markets function explains why this relationship has remained structurally consistent across multiple rate cycles.

The yield spike itself rarely kills a bull market — it's the ERP collapsing that does the real damage. Watch the spread, not just the number.

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