Reddit mentions of Macroeconomics

http://www.amazon.com/gp/aw/d/1429218878?pc_redir=1409316902&robot_redir=1

Am I allowed to suggest two?

Macroeconomics by Gregory Mankiw

International Macroeconomics by Robert Feenstra/Alan Taylor

Most people here in /r/economics know basic economic concepts (well, a sizeable percentage, at least) but it seems to me that few actually know much about international macroeconomics and how markets work/interact on a global scale. Mankiw's is one of the most informative economic books I've ever read, but Feenstra/Taylor's was one of the most enlightening.

After giving it some more thought I'm going to offer you some more information

"Whether the advantages which one country has over another be natural or acquired is in this respect of no consequence. As long as the one country has those advantages, and the other wants them, it will always be more advantageous for the latter rather to buy from the former than to make." Adam Smith, The Wealth of Nations

I really cannot be bothered typing out two chapters of college level economics for you in order for you to be able to understand why you are wrong. So if you're not going to take my word take the word of the founder of modern economics. If you are going to choose to be so strongly opinionated about economics I suggest that you actually read up on the subject matter. I would suggest http://www.amazon.com/Macroeconomics-N-Gregory-Mankiw/dp/1429218878/ref=sr_1_2?ie=UTF8&qid=1322791342&sr=8-2

Edit: Actually http://www.marxists.org/reference/archive/smith-adam/works/wealth-of-nations/book04/ch02.htm explains it quite well in simple terms.