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An author writes because he loves the subject at hand. Indeed, he loves that topic so much that he doesn’t particularly care about its connection to the rest of reality. His motto, like that of the immortal Edith Piaf and all other heedless lovers, is Je m’en fous du monde entier.1
An author writes the bits on either end of a book because he feels that he has to. Readers, he has been told, need an introduction that will draw them into the heart of the subject at hand, and, once the visit is complete, a conclusion that will convince them that the experience was worth their while.
The fruits of such forced labor are rarely as sweet as those the author tended with true love. What is worse, the attempt to connect the things that he knows best to matters of lesser interest often results in errors. (Such mistakes abound, so much so that I have adopted a rule that forbids me from complaining of mistakes of fact committed in the first or last chapters of a book, or the first and last paragraphs of an article.)
As this is a family-friendly blog, I will translate this as “For all I care, the whole world can take a long walk off a short pier.”
It took me forever to figure out how I wanted to start my novel. I don't even want to think about how I have to end it. (Sigh) Why can't books go on forever?
This must have a strong discipline specific context, as I find the middle of most economics focused books to be the worst (many other academic style works as well). Typically the authors front end load all the actual argument and thought, and the middle serves as the place to hide all the rather questionable examples needed to pad out the book to be more than a journal article. Of course, it is entirely possible economists and others have decided the vast majority never read more than the introduction anyway, and so optimize for convincing you they are right up front and just phone in the rest :D