Yves here. While this paper pursues a very important question about norms, I have strong doubts about its conclusions, which is basically that there are clear tipping points and they are durable. For instance, abortion rights are far from settled in the US. The women’s liberation movement made the huge tactical error of not getting abortion rights enshrined in legislation, and instead relied on the Supreme Court to hold their win. Richard Nixon made sure that abortion rights meant less than they seemed to by refusing to fund the procedure. And despite the belief that women can get an abortion, that right is increasingly empty as MDs are not learning how to do abortions in med school, Six states have only one clinic, and in 2014, 90% of US counties had no clinic. Moreover, many conservative state make abortions a two-day process by requiring women to hear lectures about how they are killing a fetus and watching videos and then waiting 24 hours after that to have the abortion. How many low or even middling income women can afford to take two days off from work, even before allowing for possible long driving times?