A system to enable the formulation of multi-party investments contracts. The system allows an ordering party to input contract data relating to at least one phenomenon that has a range of future outcomes and a future time of maturity. The contract data further includes a set of probabilities of occurrence for each outcome in the range and a consideration due to a counterparty at or after the time of maturity. One or more counterparties can input registering data including a set of probabilities of occurrence for each outcome in the range. The system prices and matches a contract by applying at least one template of entitlement as a function of outcome to each counterparty's set of probabilities to give one or more individual counterparty prices each equal to the ordering party's consideration, and further, applying the ordering party's set of probabilities to each template to derive an implied entitlement.