He (serendipitously) said it: “We find that faculty with higher pay and greater research productivity are less supportive of unionization, even after controlling for job title and department. Attitudes matter as well: after accounting for pay and productivity, faculty in fields documented elsewhere to have more politically liberal participants are more likely to support unionization.” For those at home needing a translation, unproductive progressives want unions. I, of course, am an unproductive something else.
A well-articulated paper on coal externalities that includes study of both negative and positive spillovers. Well done.