A method for determining an optimal sharing mix in a shared savings prescription plan, the method includes identifying a first drug group and a second drug group, wherein the first drug group and the second drug group are formulary equivalents of each other and each include one or more prescriptions, determining a total cost to the first entity for the first drug group and an estimated total cost to the first entity for the second drug group, determining a savings rate associated with utilizing the second drug group versus the first drug group, determining a distribution amount as a function of the savings rate and the total cost to the first entity for the first drug group, and distributing the distribution amount to at least one of a first entity, a second entity, and a third entity based upon one or more predetermined percentages.