  Clearly, socio-economic freedom requires some extent of transparency
regarding the implications of choices. In this paper, we review some
established mechanisms for achieving such transparency, without any claim to
completeness, and briefly discuss potential future directions. Our
investigation is structured by four "challenges" under which we subsume the
various requirements on, and approaches to, socio-economic transparency
mechanisms. One main focus is on the inference, i.e., statistical, aspect of
such mechanisms.
