Before revision:  Here one applies the market information of derivative prices on a traded 'quasi twin security' to benchmark a single-step stochastic cash stream. We provide a transparent, more or less closed-form solution for valuing these streams .
After revision:  Here one applies the market information of derivative prices on a traded 'quasi twin security' to benchmark a single-step stochastic cash flows. The valuation is based on constructing in a canonical way a European style derivative on a benchmark security such that the physical payoff distribution coincides with the (corrected) physical asset price distribution. It turns out that this pricing technique is economically viable under some natural cases .