I've been looking through some 990s to get a rough idea, but that ballpark percentage difference is what I haven't been able to figure out.
Thanks!
What is the "moral reservation premium" in salary expected in return for selling out and working for an employer seen as less socially responsible?
* a typical student would rather work as an advertising copywriter for the american cancer society than an advertising copywriter for camel cigarettes, and would want a salary 50% higher to do it for the cigarette company
* a typical student would want +17% salary to work as an accountant for a petrochemical company instead of doing the same job for an art museum
* "men are more likely than women to sell out, and this accounts for at least part of the gap in average salaries between men and women"
more detail in: R H Frank, "Can Socially Responsible Firms Survive in a Competitive Environment?" 1996
For organizations that are closely aligned with humanitarian causes (e.g. health projects in the developing world), I've noticed a much higher gap, presumably because these organizations are able to attract talent that's more passionate about the cause/willing to accept lower compensation.