alt Hacker News>It can mean moving within a class.
It can, but it's not how it's used most of the time, so kind of a pedantic distinction.
And many do not even want to "move within a class" that much. They'd be satisfied to keep their job and retain the same constant purchasing power and ability to buy food, feed family, pay rent/morgage, year after year.
Jocks becoming nerds or vice versa or both becoming hipsters, are examples of intraclass mobility.
There's also cultural mobility which is different from economic mobility.
All are exemplified by reddit's Ohanian marrying one of the Williams sisters and thus having a either higher or lower social status, than either Ghislaine or Larry Summers, quite independently of how much cash they each have in the bank
I wonder if popalchemist would count the cultural station as something worth improving apart of the economic one