The reasoning is to keep some investments non-correlated with stocks/bonds. [This correlation matrix site](https://www.etfscreen.com/correlation.php) is useful for investigating this.
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Schwab ETFs do not have much option liquidity. For such cases, I might use different ETFs or futures to represent the same category. Sometimes it is also cheaper to purchase ETFs with a higher price due to trading fees being based on number of shares. Some equivalents:
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Schwab ETFs do not have much option liquidity. For such cases, I might use different ETFs or futures to represent the same category. Sometimes it is also cheaper to purchase ETFs with a higher price due to trading fees being based on number of shares. I also may use mutual funds if I don't plan to do much active trading. Some equivalents: