Economic development and the structure of cross-technology interactions

Most explanations of economic growth are based on knowledge spillovers, where the development some technologies facilitates enhancement others. Empirical studies show that these spillovers can have a heterogeneous and rather complex structure. But, so far, little attention has been paid to consequences different structures such cross-technology interactions: Is more easily fostered by homogenous or interactions, uni- bidirectional spillovers? Using detailed description an r&d sector with interactions embedded in simple model, we analyse how structure influences prospects patterns. We type (e.g., one-way interactions) cannot induce exponential growth, whereas other can. Furthermore, depending all only will contribute long run. Finally, spillover lead patterns, as technology transitions, where, over time, clusters main engine growth.