Simply put, should I sell my MacroEconomics Book? Or keep it?

Plus, is there aplia type program we need for MicroEconomics?

The first four chapters are the same for Macro and Micro, but they diverge after that up to you whether you want to buy the text or not. And no there is no Applia for Micro, only Avenue assignments, at least as of Term 1.

Hope that helps!

Macro and micro are very different outside the first four chapters.

That said, if you have Holmes, you should be fine with the powerpoints alone. I guess the textbook would be helpful if you need detailed explanations or something.