Future overall demand for professors can be predicted with reasonable accuracy from current birth rates. But the accu...

Emil-Kunkin on March 2 at 04:33PM

I think the passage is showing that the more detailed the thing in question we are trying to predict, the less able we are to make predictions from only general, high level evidence. We don't have any detailed and complete evidence here, so it would be hard to say that the passage stands for a proposition about such evidence.