I will recommend a pair of books that are about the question you are asking: http://shop.nplusonemag.com/collections/books-n-1/products/what-we-should-have-kno

I will recommend a pair of books that are about the question you are asking: http://shop.nplusonemag.com/collections/books-n-1/products/what-we-should-have-known-two-discussions http://shop.nplusonemag.com/collections/books-n-1/products/w... http://shop.nplusonemag.com/collections/books-n-1/products/no-regrets http://shop.nplusonemag.com/collections/books-n-1/products/n...