  In our simplified description `wealth' is money ($m$). A kinetic theory of
gas like model of money is investigated where two agents interact (trade)
selectively and exchange some amount of money between them so that sum of their
money is unchanged and thus total money of all the agents remains conserved.
The probability distributions of individual money ($P(m)$ vs. $m$) is seen to
be influenced by certain ways of selective interactions. The distributions
shift away from Boltzmann-Gibbs like exponential distribution and in some cases
distributions emerge with power law tails known as Pareto's law ($P(m) \propto
m^{-(1+\alpha)}$). Power law is also observed in some other closely related
conserved and discrete models. A discussion is provided with numerical support
to have a dig into the emergence of power laws in such models.
