Why do sales people get commissions and engineers don't? Because the sales person knows exactly how much money they bring in and can claim "if I didn't make the sale, that money would not be coming in" even though it's not always true it's a good story. An engineers actions are so far removed from revenue that they can't make a claim so directly. Also, if they did want to claim a portion of product revenue they could…
> the sales person knows exactly how much money they bring in I agree this is the key factor. Any job where a person can argue a clear, direct, measurable link between their work and profit is a job that can be paid based on financial results. Other jobs where you see this: financial traders, consultants with direct client contact. To take the other extreme, look at teachers. They have the potential to generate huge…
The problem is not that it's hard to measure. The people is that teachers actually have very little ability to make a marginal impact on their students though their performance, except at the very tail ends of the distribution.
In other words, structural factors that teachers can't directly control, like family support or district curriculum standards, have a much larger impact on student performance than teaching quality does. (Except, of course, for the exceptionally bad teachers, but that's better addressed by firing them than by adjusting the compensation strategy).