The trade paperback (TPB) is a bastard; it has neither the endurability of a hardcover nor the utility of mass-market paperback (MMPB). I first read nearly all of my favorite books in MMPB format: Catch-22, Slaughterhouse Five, Absalom, Absalom!, The Cider House Rules, Billiards at Half Past Nine, War and Peace. I consider it a far superior format to TPB.
I come from the 1970s and 80s, when one could find almost any fiction, literary or genre, in MMPB. So far as I can recall, Lolita was the only book in TPB in my AP English class. Now many of those same books seem to be available only in TPB, unless they have passed into public domain and can be published in the cheapest MMPB available, and high school and college students are stuck paying twice as much.
Which is, of course, the reason for TPB's prevalence. Yes, there are some precious souls who claim they prefer TPB because the margins allow for notes. I suspect such persons hope that someday historians will pore over their library the way they pore over Mr. Lincoln's, seeking some insight into genius. I do not write in books. I have found inane every note I have happened upon in a book, and I see no reason to commit my own inanity to posterity.There's nothing wrong with a hardcover. It's large, it lasts, it looks nice on the shelf. But I cannot afford many, and I can't lug them around.
The MMPB is democratic, egalitarian even. It was once affordable, and in comparison, still is. It can fit in one's pocket or lunch pail, and its former low cost meant it was no great tragedy if a cup of coffee were spilled over it. No matter the content, it rose no higher on the shelf than its neighbors. It did not say I AM IMPORTANT, which the TPB does in its anxious, upper-middle-class way.

A TPB doesn't cost dramatically less than a hardcover, especially if you're willing to hunt around. And yet it is bound in the same flimsy manner as the MMPB, and its paper is usually no better. It does not fit in the pocket, and one is out $17.99 plus tax if it is drowned in $4 gourmet coffee. The critic Pauline Kael famously refused to call movies "films," and I have come to suspect anyone who does. TPBs are the "films" of publishing.
And there we have the great scam the flimflammers have sold the pretentious, those who read Important things. TPB has come to suggest some distinction from the "mass market," i.e., the Great Unwashed: those who would deign to purchase their reading products at the grocery store--and for this distinction, the Important among us will happily pay a premium.To my mind, it's a sad distinction. The grocery store book buyer sees a TPB and thinks, "that's not for me," though there's (often) as much romance and intrigue to be found between those pages, and (often) twice as well-written. And the reverse is true as well.
Thankfully, the science fiction and fantasy sections have not yet fully succumbed to the TPB contagion. Always more democratic than their "Literary" cousins, those corners of the bookstores still look much the same as they did decades ago, though the books are much fatter and it's a rare one with a cover as glorious as those Michael Whelan ones of eld. Only those rarefied few such as William Gibson and Philip K. Dick--those whom some would dare to call Important--tend to get the TPB treatment.

None of this is to suggest that TPB has no reason for being. Graphic novels, for instance, usually don't work in MMPB, and anything else art-heavy needs a larger size. But all text? Please. If memory serves, I've even seen TPBs with endnotes about the typography. That's like eating caviar from a Dixie cup.
I read War and Peace in MMPB, and I can't imagine reading it any other way. Yes, I know there are new translations, and I'm sure they're much better, but I've looked at those editions, and while handsome, I just don't see lugging around a phone book. I'll wait until they're in MMPB.
