1. The 4.8% differential is not the same for all levels of education. Workers with the least amount of education actually do better in the public sector than the private sector. As education level increases, the wage discrepancy becomes greater. I have seen this result reported elsewhere, and I believe it is relatively non-controversial.
2. On average, public sector workers have more education than those in the private sector.
3. This means that, on some level, the protesters in Madison are fighting for the wages of a workforce that is more highly educated on average. Admittedly, calling the budget repair bill an, "assault on the middle class," is rhetorically more effective than, "these college graduates can't afford wage cuts."
4. The percentage of teachers in the public sector work force have a dramatic impact on the results. When you don't account for hours worked, EPI found that Wisconsin workers were, "undercompensated by 8.2%," but when they controlled for hours worked that number decreased to 4.8%. EPI reports:
Full-time public employees work fewer annual hours, particularly employees with bachelor’s, master’s, and professional degrees (because many are teachers or university professors).
5. To say that teachers work fewer hours than private sector workers is not a slight. Having holidays and time off in the summer go with the job, the same way that working swing shift goes with some mill jobs. Common sense would indicate that there is a value to having time off and that this value would show up as a discrepancy in compensation between public and private sector workers. EPI downplays this with their control for hours worked. My question on this, then, is whether all hours are treated equally. Couldn't part of the compensation differential, even after adjusting for total hours worked, reflect the fact that teachers spend some of the most valuable hours away from work (i.e. at the holidays and in the summer)?
Finally, we should try to grapple with why it is that the compensation differential gets worse as education increases. This reflects the fact that the rate of wage growth due to education is much higher in the private sector, but why should that be. I see two possible reasons:
7. First, for some jobs requiring high levels of education cultural and political norms are a barrier to paying compensation equal to the private sector. As a society we may simply believe that these folks should be motivated, in part, by a desire to do public service. For example, do you think we are ever going to pay SEC employees salaries comparable to what they could get on Wall Street? I don't. At the same time I suspect this is a relatively small factor in the compensation differential story.
8. The other reason may, once again, come back to the presence of a large number of teachers in the public sector work force. According to the EPI data 22% of state and local government workers had a master's degree, compared with only 5% of the private work force. According to the US Department of Education, in 2007-2008 there were over 175,000 master's degrees conferred where the field of study was education. Education has been the most popular field of study for master's degrees at least since 1970-1971. The only other field that comes close is business. Given that so many public sector workers work in the education field, the relative abundance of master's degrees in education could be contributing to the public sector wage differential. It is true that EPI controls for level of education, but do they treat all master's degrees the same? This would seem to be a mistake given education's popularity as a field for graduate level study.
While the discussion continues here in Wisconsin and beyond, you will no doubt continue to hear that public sector workers are undercompensated by 4.8%. I hope that this discussion has shown you can be skeptical of that number, even without resorting to partisan attacks on the study's authors. For me, the telling sing of the day when most public sector workers are undercompensated will come when we are no longer able to hire and retain workers. In a timely bit of blogging from Eggster, we see that we are nowhere near that point yet.
