In many empirical studies, researchers seek to estimate causal relationships using instrumental variables. When only one valid instrumental variable is available, researchers are limited to estimating linear models, even when the true model may be non-linear. In this case, ordinary least squares...

We show that every time a local economy generates a new job by attracting a new business in the traded sector, a significant number of additional jobs are created in the non-traded sector. This multiplier effect is particularly large for jobs with high levels of human capital and for high tech...