It could be a genuine mistake by the original writer, but I expect a textbook to have higher proofreading standards. Especially if this is a grade-school textbook (it looks like one), where you can't reasonably expect the student to reference other sources to verify the contents, then I would expect the textbook publisher to put a lot more effort in to catching this sort of thing. And I don't mean someone reading over it for typos, I mean someone who knows the field the book is written about, who can proofread for accuracy not just grammar. Genuine mistake or not, this is completely inexcusable.
It would be correct if it said bourgeoisie there, right?
I’m sort of wondering if it was a genuine mistake on the part of the textbook authors.
It could be a genuine mistake by the original writer, but I expect a textbook to have higher proofreading standards. Especially if this is a grade-school textbook (it looks like one), where you can't reasonably expect the student to reference other sources to verify the contents, then I would expect the textbook publisher to put a lot more effort in to catching this sort of thing. And I don't mean someone reading over it for typos, I mean someone who knows the field the book is written about, who can proofread for accuracy not just grammar. Genuine mistake or not, this is completely inexcusable.