US 10YR ‘real’ rates are essentially US 10yr Treasuries adjusted for 10yr inflation expectations – TradingView users can set this up using the equation: TVC:US10Y-FRED:T10YIE.
We can see this as the true cost of capital and in effect, the higher yields rise the more this supports the USD and negatively impacts US equity valuations. The rate of change (ROC) is always important, but if US 10yr real rates head to 2% then this may accelerate the selling in the US500 and NAS100.