The dynamics of individual characteristics of economic agents is modeled with the link structure influenced by this dynamics: links between agents with similar characteristics are more stable than those between agents with vastly different characteristics. A simple scaling law describes the...

A model of new-product diffusion is proposed in which a site-percolation dynamics represents socially driven diffusion of knowledge about the product's characteristics in a population of consumers. A consumer buys the new product if her valuation of it—formed after her witnessing the product...

We propose a stochastic model of interactive formation of individual expectations regarding the business climate in an industry. Our model is motivated by a business climate survey conducted since 1960 in Germany by the Ifo-institute (www.ifo.de). In accordance with the data structure of this...

We propose a simple Keynesian business cycle model in which national income expectations of heterogeneous interacting investors affect their investment decisions. The investors' expectation formation is influenced by their sentiment: investors who hold optimistic views about the future state of...

We re-explore the consequences of some popular countercyclical intervention rules in a simple Keynesian-type macroeconomic model in which the dynamics of consumer sentiment and business cycles are intertwined. We find that fiscal policy does not only have a direct effect on national income via...