Assuming 30 trading days horizon, Thornburg International Value A is expected to under-perform the Thornburg. In addition to that, Thornburg International Value A is as risky as Thornburg. It trades about -0.35 of its total potential returns per unit of risk. Thornburg International Value I is currently generating about -0.34 per unit of volatility. If you would invest  3,074  in Thornburg International Value I on May 20, 2013 and sell it today you would lose (166.00) from holding Thornburg International Value I or give up 5.4% of portfolio value over 30 days.