Asset class size and style power rankings are rankings between U.S.-listed asset class size and style ETFs on certain investment-related metrics, including 3-month fund flows, 3-month return, AUM, average ETF expenses and average dividend yields. The metric calculations are based on U.S.-listed ETFs that are classified by ETF Database as being mostly exposed to a specific asset class size and style. If an ETF changes its asset class size and style classification, it will also be reflected in the investment metric calculations. The calculations exclude all other asset classes and inverse ETFs.