We challenge the hypothesis of the efficient frontier portfolios by using network approach. In a small-world network interacting agents decide upon the portfolio selection solely upon past returns. Simulation results indicate that agents are capable of forming the efficient frontier, whereas...

We study the stability of the banking system after a mortgage shock when a discretionary bailout policy is applied. Results suggest that the authority should be focused on preventing contagion. The decision over the appropriate policy depends upon the goal which the authority wants to pursue....

The paper provides methodologically new approach to pricing CDS, predicated on the banking network and the banks' balance sheets. The model is evolutionary and includes a counterparty risk and the central bank bailout policy. The banking network is used to accurately calculate the capital ratio...

The paper is an examination of the interaction-based approach in economics and finance. The economy is considered a complex adaptive system that consists of a large number of interacting units who are represented as software bits of data and the rules of conduct. Heterogeneity, evolution,...

In the paper we simulate a heterogeneous-agent version of the wage-posting model as derived by Montgomery (1991) with homogeneous workers and differently-productive employers. Wage policy of particular employer is positively correlated with employer's productivity level and the wage policy of...

The model of social network is used to analyze the impact of the power of labor unions in the labor relations. We find that labor union capable to affect a pecuniary compensation of shirking employees lessens the motivation of employees to work and improve to the unionization rate. As a result,...

In the paper we test a homogenous agent version of the Montgomery's (1991) non-cooperative wage posting model. The inclusion of intrinsic costs, related to the uncertainty when changing the alternative agents are already using, alters the outcome of the model in two respects: firstly, it...