ETF inflows remain consistent regardless of whether the S&P 500 posts gains or losses, according to market analysis. The data indicates that investor behavior toward exchange-traded funds shows no significant variation between up and down months for the index. This pattern reflects what analysts describe as the "Vanguard Put," a phenomenon where investors maintain steady dollar-cost averaging into low-cost index funds and US equities irrespective of market conditions. The persistent flow suggests a structural commitment to passive investing strategies that continues through volatility cycles.