In recent times the employment effects of technical progress raised much intention. Will recent productivity gains lead to technological unemployment or to a new prosperity? In our paper it is shown formally that under general and standard preconditions the price elasticity of demand on product...

The randomized trial literature has helped to renew the fields of microeconometric policy evaluation by emphasizing identification issues raised by endogenous program participation. Measurement and attrition issues have perhaps received less attention. This paper analyzes the dramatic impact of...