Taylor Marvin reads the above chart as an implication that cultural dating norms may change as well-educated women out-earn men:
What’s the point of an expectation that a high-earning man buys a female date dinner if there’s a good chance she makes more than him? This may just be male solidarity talking, but it’s hard to argue that this practice fits any definition of fairness. Similarly the traditional requirement of engagement rings, and by extension traditions that place the burden of proposing on men, is hard to justify in relationships where the female is the higher earner. As woman educational attainment continues to increase, we can expect these practices to become less common.
The Dish 