Abstract: A body of information elements is maintained including facts, assumptions, and relationships, at least one element being generated from the others using the relationships and representative of an estimate of a value of, or a market size of a product or service associated with, an asset. The relationships each define how a resulting fact or assumption can be generated from at least one source fact or assumption. The way in which the at least one source fact or assumption can be generated from another source fact or assumption is defined in each of multiple instances by one of the relationships. The body of information is exposed through a publicly accessible communication medium on a non-discriminatory basis. On the communication medium, users are enabled to engage in moderated collective discussion concerning the information elements. Users are enabled to participate financially in contracts having values that are tied to the estimated value of the asset.