Mountain range options are very difficult to value because of the increased variables that must be analyzed, such as the correlation between the individual securities in the basket and the coupon step-up rates that are offered at longer time horizons. Annapurna options have only been on the market since the late 1990s, and only a few select stocks have ever found themselves marketed inside one. Investors in these exotic options will aim to let the option ride out as long as possible (and conceivably earn the highest total return) by choosing stocks that will consistently rise, with the hopes that none of the group ends the life of the option by falling too far.