For education, not advice. Backtests use monthly total returns of low-cost index funds as asset-class proxies. Past performance does not predict future results — a portfolio that looked great over one historical window can do poorly over the next. Fund fees beyond the index funds’ own, taxes, bid/ask, and your own behavior are not modeled.
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Data: Vanguard index funds & ETFs and US CPI, via public sources.
Part of austinlev.dev — four research tools, and a note on where this is headed.