I've noticed this in the evolution of my married friend's life with his wife. When they married, he made more than her (LGM at a major car dealership, she in school for nursing) and the dynamic was more in his favor. When they moved back to the area and he took a (likely temporary) pay cut to pursue a career he enjoyed more and her schooling was complete, the power shifted in her favor. I see it in subtle ways - he is more beholden to her activities, can't easily spend time out unless she is working a full weekend, etc. I am no way indicting her as a bad person (quite the opposite), but you can see who wears the pants now.
She also watches every penny he spends. I have a dealership myself and I buy old lady cars on the side for fun and profit (I like FWD 80s/90s GM cars, so I buy old snowbird Park Avenues, Cutlasses, Rivieras, LeSabres etc. for $500-1000 out of trailer parks, recondition them, and sell them on my lot to the modern classic community for $2500-5000 depending on the car - I've done it for 8 years and people around here actually know me for these cars). Last time I offered to go in on a car with him, I had to enjoin myself in this big story about he was lending me $500 because I was broke and if she found out he spent this money trying to make money on some car she didn't like, I would have to guarantee his initial investment, blah blah. If I want a floorplan, I'll get a floorplan and if you can't spend $500 without a third degree, please don't involve me in your marital drama.