> That is a tautology That is most certainly not a tautology. Afford isn't used in the "have enough money to pay for" sense here; it's used in the "able to do

> That is a tautology That is most certainly not a tautology. Afford isn't used in the "have enough money to pay for" sense here; it's used in the "able to do without adverse consequences later on" sense. So what it means is that you are able to buy the textbook without having to struggle to pay for other things later on.