Domar aggregation under nonneutral elasticity of substitution

The characteristics inherent in a Domar aggregation, when all sectoral productions embody a common nonneutral elasticity of substitution, is examined. There, the general equilibrium propagation of productivity changes entails structural transformation that brings nonlinearities in their aggregation into price indices. We show that negative singularity, such that a finite productivity decrease induces an infinitely large price, is possible in an inelastic economy, while positive singularity, such that a finite productivity increase induces a zero price, is possible in an elastic economy. Regarding the aggregate outputs, two independent productivity changes will have synergism in an elastic economy, whereas negative synergism will be prevalent in an inelastic economy. Neither issue is of concern in a Cobb-Douglas economy where the elasticity of substitution is everywhere neutral.