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Investing - Theory, News & General • Re: Let's Talk SPX Box Spreads

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Short SPX box spreads are once again below 4% through at least December 2028. Given the market's (VT's) long term return of near 10%, and the fact that the "interest" you pay on the short box is deductible, using moderate (1.2x and lower?) amounts of leverage on a taxable account makes a lot of sense.
With this strategy in particular, I think it's dangerous to think of the long term market return as being same as the expected return (ER). This is a difficult concept and one a lot of people struggle with, but essentially equity returns should be reflective of risk-free rate (RFR) plus a risk premium (RP). Both of those variables are in flux, but ultimately, the following statements should be true:

Bonds ER = RFR + RP

Equities are (broadly) riskier than bonds. Therefore,

Equities ER = RFR + RP (higher than bonds)

This should hold true even in high interest rate environments. Therefore, even if the borrow rate is 15%, equity expected return should still outpace it (ER >15%). That said, I would hypothesize that the higher the interest rate, the smaller that spread is (just a theory).

My point is, I would ignore the long-term return entirely as a measure against the current interest rates in determining "should we leverage" or how much ER we're gaining by leveraging.

Statistics: Posted by DMoogle — Tue Sep 10, 2024 10:03 am



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