Greatest Happiness and Optimal Happiness

The complete satisfaction of each of one's wishes can be called one's 'greatest happiness'.  Likewise, the achievement of the greatest happiness of each party can be called the 'total' greatest happiness.  Thus, the total greatest happiness entails the compossibility of each of the individual greatest happinesses.  However, as the Law of Supply and Demand reflects, that compossibility cannot be presumed to obtain, therefore, requiring compromise, typically via negotiation, the optimal result of which is the point of equilibrium.  So, the best-case scenario under such conditions, for either individual party or collective, can be called the 'optimal' happiness, which is likely what Mill intends by the formulation 'greatest happiness for the greatest number', if the standard application of the Utilitarian Calculus is any indication.  Now, Utilitarianism vacillates between description and prescription, i. e. between a characterization of how people actually conduct themselves, and a formula for determining the best course of action.  But, the problem with the latter is that, as has been previously discussed, there can be a discrepancy between real equilibrium and apparent equilibrium, with the latter the product of expressed terms, rather than of what is privately willed, and, hence, the product of guesswork.  In other words, the utility of the Utilitarian Calculus is itself limited by the unavailability of requisite knowledge, i. e. the real will of others.