<p>Double wow. Resnick and Halliday, if I remember right, and Sears and Zemansky too for me circa '70.
In defense of the profs, the payoff from text books is so low because of the limited market, so they’re probably trying to improve the payout. My only publication was a chapter in a comp sci book published by my grad school advisor around '80 and I got royalties of about a hundred bucks. But then how much has general/intro physics or calculus changed in the last 30 years to merit newer books? </p>