Three essays on labour productivity

My work consists in three papers in which I analyze different aspects regarding the effects of increased productivity of labour. I progressively increase the "range" of my analysis: I start considering a partial equilibrium framework, where a limited number of firms compete using innovation as a competitive threat; I then consider a general equilibrium setting in order to investigate the effects of increased productivity of labour over employment rate, wages and welfare spending; I finally consider a system dynamic approach to simulate the long-run effects over employment and other macroeconomic variable of increasing productivity assuming a trade-off between labour and energy efficiency.