  We review a simple model of closed economy, where the economic agents make
money transactions and a saving criterion is present. We observe the Gibbs
distribution for zero saving propensity, and non-Gibbs distributions otherwise.
While the exact solution in the case of zero saving propensity is already known
to be given by the Gibbs distribution, here we provide the explicit analytical
form of the equilibrium distribution for the general case of nonzero saving
propensity. We verify it through comparison with numerical data and show that
it can be cast in the form of a Poisson distribution.
