One example of luxury belief is that all family structures are equal. This is not true. Evidence is clear that families with two married parents are the most beneficial for young children. And yet, affluent, educated people raised by two married parents are more likely than others to believe monogamy is outdated, marriage is a sham or that all families are the same.
Relaxed attitudes about marriage trickle down to the working class and the poor. In the 1960s, marriage rates between upper-class and lower-class Americans were nearly identical. But during this time, affluent Americans loosened social norms, expressing skepticism about marriage and monogamy.
This luxury belief contributed to the erosion of the family. Today, the marriage rates of affluent Americans are nearly the same as they were in the 1960s. But working-class people are far less likely to get married. Furthermore, out-of-wedlock birthrates are more than 10 times higher than they were in 1960, mostly among the poor and working class. Affluent people seldom have kids out of wedlock but are more likely than others to express the luxury belief that doing so is of no consequence.
Another luxury belief is that religion is irrational or harmful.