  The Brain Drain phenomenon is particularly heterogeneous and is characterized
by peculiar specifications. It influences the economic fundamentals of both the
country of origin and the host one in terms of human capital accumulation.
Here, the brain drain is considered from a microeconomic perspective: more
precisely we focus on the individual rational decision to return, referring it
to the social capital owned by the worker. The presented model compares utility
levels to justify agent migration conduct and to simulate several scenarios
within a computational environment. In particular, we developed a simulation
framework based on two fundamental individual features, i.e. risk aversion and
initial expectation, which characterize the dynamics of different agents
according to the evolution of their social contacts. Our main result is that,
according to the value of risk aversion and initial expectation, the
probability of return migration depends on their ratio, with a certain degree
of approximation: when risk aversion is much bigger than the initial
expectation, the probability of returns is maximal, while, in the opposite
case, the probability for the agents to remain abroad is very high. In between,
when the two values are comparable, it does exist a broad intertwined region
where it is very difficult to draw any analytical forecast.
