Formula & Calculation Mechanism
10Y Nominal Yield = 10Y TIPS Real Rate + 10Y Breakeven Inflation Rate
Rising 10Y yields increase corporate borrowing costs and discount rates, lowering the present value of future corporate earnings—especially impacting high-growth tech stocks.
Market Impact on US Equities & S&P 500
Rapid spikes above 4.50% compress S&P 500 valuation multiples. Orderly declines toward 3.80% provide a tailwind for equity prices.
Historical Precedents & Bull/Bear Regimes
In October 2023, 10Y yields surged to 5.02%, causing an 10% pullback in SPX before staging a massive rally as yields moderated.