Wondering if anyone has ever invested in the S&P500 index fund like IVV or SPX based on the CAPE Ratio. For example, if CAPE is at xx then account allocation percentage should be in xx in IVV. If CAPE goes up the allocation into IVV should be lowered. And if CAPE goes down, allocation into IVV should be raised. Not sure how to back test that. Wonder what the historical returns are.
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