  We report on results concerning a partially aggregated Stock Flow Consistent
(SFC) macroeconomic model in the stationary state where the sectors of banks
and firms are aggregated, the sector of households is dis-aggregated, and the
probability density function (pdf) of the wealth of households is exogenous,
constrained by econometric data. It is shown that the equality part of the
constraint can be reduced to a single constant-sum equation, which relates this
problem to the study of continuous mass transport problems, and to the sum of
iid random variables. Existing results can thus be applied, and provide
marginal probabilities, and the location of the critical point before
condensation occurs. Various numerical experiments are performed using Monte
Carlo sampling of the hit-and-run type, using wealth and income data for
France.
