This paper introduces endogenous and directed technical change in a growth model with environmental constraints. A unique final good is produced by combining inputs from two sectors. One of these sectors uses "dirty" machines and thus creates environmental degradation. Research can be directed...

Using data that permit a distinction between flows of workers, directly measured, and job creation and destruction, again, directly measured, we develop employment and job flow statistics for a representative sample of French establishments for 1987 to 1990. Annual job creation can be...