A couple of months ago, my literary novel was published by a major trade publisher. I have a rough idea of how many copies I've sold, but not how that compares to my publisher's expectations. What constitutes good sales for a literary novel? No one will give me a straight answer.
Ah yes. I will give you a straight answer, because I'm a sucker, but I'm sure others will argue with me.
The opening line to this discussion is probably (of course) "It depends," but I won't insult you with that. I'll give you a number.
If you sold 7,000 or more copies, in hardcover, of your literary novel, you're a star. (Some people sell much more, but 7,000 is a serious threshold. Who knows why.)
If you've sold between 4,000 and 7,000 copies, in hardcover, of your literary novel, you did a damned good job. You're what they call a "strong seller." You're also in a good position to place your second novel well, with your current publisher or elsewhere.
If you sold between 2,000 and 4,000 copies of your literary novel, you sold pretty strongly. You're still in a good position to have your publisher want to take on your second project, or to comfortably find a home elsewhere.
If you sold below 1,500 copies, your publisher is probably disappointed, although they will never tell you that. Instead, they will tell you that debuts are hard, and literary fiction is nearly impossible. Both these things are true.
These numbers are specific to literary fiction--"commercial" fiction is going to have slightly higher expectations behind it. Your publisher might also be happier or sadder with your numbers depending on how much they paid for your novel, but odds are, if it is in fact literary fiction, they bid with these kinds of specs in mind. But regardless of how your publisher feels, if you break the threshold, you'll still look good to other publishers.
These numbers are, of course, my opinions. I'd be interested to hear other industry professional opinions, and also reader's opinions--are you surprised? Did you imagine that fewer or more copies constituted success? (Sometimes, stuck in my ivory tower, I lose perspective.)