That's exactly what I'm asking for: a clearer explanation. I don't believe the paper's conclusion, but I don't understand your criticism of it. If you're sayin

That's exactly what I'm asking for: a clearer explanation. I don't believe the paper's conclusion, but I don't understand your criticism of it. If you're saying the estimated curve is inappropriate, a better argument would be that they should include more terms of the work-hours Taylor expansion to get a better fit. Or perhaps there are confounding variables left out of the model.