[This paper on risk parity](https://www.aqr.com/-/media/AQR/Documents/Insights/Perspectives/Risk-Parity-Why-We-Lever.pdf) generally describes how I use leverage.
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Other forum threads:
- [Lifecycle Investing - Leveraging when young](https://www.bogleheads.org/forum/viewtopic.php?t=274390)