Abstract: The present invention provides for computer based systems and program controlled methods for reducing investors' exposure to the variability of an asset class's short-term volatility using rules-based long-only investments in various asset classes in which portfolio weights are dynamically rebalanced on a regular basis to a desired target volatility. This is achieved by constructing an index that represents a portfolio of liquid futures contracts, rebalanced as often as daily with the objective of maintaining the portfolio's volatility at a given level, typically the long-term average risk of that asset class. The index therefore is expected to exhibit relatively stable risk at all times when compared to the asset class's risk levels including during periods of high market volatility.