PartI: Social Networks -- A Simple Model of Fads and Cascading Failures on Sparse Switching Networks -- Self Organised Criticality in Economic and Social Networks - The Case of Innovation Diffusion -- Social Percolators and Self Organized Criticality -- Lock-out in Social Networks -- Cooperation, Adaptation and the Emergence of Leadership -- PartII: From micro to macro behaviours -- Technology Diffusion, Stability and Decay: Some Results -- On Dynamic Re-Specifications of Kiyotaki-Wright Model -- Industrial Dynamics with Quasi-Zero Intelligence Interacting Firms -- PartIII: Finance -- Stability of Pareto-Zipf Law in Non-stationary Economies -- Toy Models of Markets with Heterogeneous Interacting Agents -- Price Bubbles and the Long Run Profitability of a Trend Following Technical Trading Rule -- Firms' Financial Heterogeneity and Business Cycles -- PartIV: Coalitions -- Stable Coalition Structures with Fixed Decision Scheme -- Coalition Formation with Heterogeneous Agents -- Location Games with Externalities -- V: Interactions and Knowledge -- "Simon says..." What ? - Rationality of Imitation in a Simonian Perspective -- Interacting Individuals and Organizations: a Case Study on Cooperations Between Firms and Research Laboratories -- Organisational Innovation, Communities of Practice and Epistemic Communities: the Case of Linux -- Knowledge Creation, Knowledge Diffusion and Network Structure.