Then, Commerce prescribes a proper amount of profit that firms selling the subject product in the non-market economy should be earning, if they were operating in a market economy, again by reference to the profit experienceof chosen firms in a similar industry in the other country.
And the reason that dancers are often said to peak in their early 30s (that sweet spot where Hines and Baryshnikov were when they made the movie, thus the reference to it) is where the increase in skill and experience is still just ahead of the decrease in pure physical ability.