I'm thinking that one way Jeff and the Stack Overflow team could squeeze some extra money out of this site would be to automatically convert all Amazon links posted here into affiliate links, e.g. Stick "tag=codinghorror-20" (or more likely a new site-specific tag) onto every Amazon link. This would bring in some additional revenue every time someone purchased a book via a link on this site. 

They could do similar things with other links as well. Amazon's simply the most obvious choice.

So my question is, would anyone have a problem with this?

I know I wouldn't mind, but I don't know how other people would react.

What does everyone think? Is this a horrible idea, a great idea, a waste of time?


Question: Sinks and Sources
Answer: hint: pay attention root of this equation x'=f(x) is  equilibrium points let $f(x_0)=0$ therefore$$if\quad  f'(x_0)\lt0 \quad then\quad x_0 \quad is\quad sink $$ and $$if\quad  f'(x_0)\gt0 \quad then\quad x_0 \quad is\quad source $$  now you can find   $f(x)$ for "1"  let $f(x)=(x-a)(x-b)(x)$ s.t $f'(x)=3x^2-2(a+b)+ab\lt0$ then calculate lower bound and upper bound for a,b also  do it for second part   $f(x)=(x-a)(x-b)(x)$ then find a,b such that $f'(x)=3x^2-2(a+b)+ab\gt0$