%0 Journal Article %A Andrew W. Lo %A Pankaj N. Patel %T 130/30 %B The New Long-Only %D 2008 %R 10.3905/jpm.2008.701615 %J The Journal of Portfolio Management %P 12-38 %V 34 %N 2 %X Long-only portfolio managers and investors have acknowledged that the long-only constraint is a potentially costly drag on performance, and loosening this constraint can add value, but the extent of the performance drag is difficult to measure without a proper benchmark for a 130/30 portfolio. A passive but dynamic benchmark can be developed, consisting of a plain-vanilla 130/30 strategy using simple factors to rank stocks and standard methods for construction of portfolios based on these rankings. Two types of indexes are produced—investable and look-ahead indexes; the former uses only prior information, and the latter uses realized returns to set an upper bound on performance. Historical simulations of these 130/30 benchmarks illustrate their advantages and disadvantages under various market conditions.TOPICS: Equity portfolio management, accounting and ratio analysis, portfolio theory %U https://jpm.pm-research.com/content/iijpormgmt/34/2/12.full.pdf