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The answers to biological questions that intelligent design advocates advance , because those answers invoke unobservable and immeasurable " supernatural " bringers of natural change , are answers that are not testable by science . This uncertainty will be modelled in Bayesian fashion , i.e ., by positing that the appreciation rates are unobservable random variables , independent of the primary sources of randomness in the market and with known probability distributions . Although the origin and destination factors are unobservable , they do have physical interpretations . This paper considers the problem of equalizing opportunities among agents who differ in both their tastes and innate productive abilities when these characteristics are unobservable .