Want to Become a Stock Market Millionaire? History Says This Investment Can Get You There.

The article recommends investing in S&P 500 ETFs as a simple, low-risk path to building wealth. By consistently investing $150 monthly since 1990, an investor would have become a millionaire today. The Vanguard S&P 500 ETF is highlighted as the world's largest ETF with $1.7 trillion in assets and a minimal 0.03% expense ratio.