I think you can also mention that with both parts of a marriage need to have jobs to pay the bills, moving is not just one getting a good deal in a different city, then the other part has to find something as well and wants something better or at least not worse. so two good offers is needed.
I also wonder what the timescale is.
I would presume this started as a factor of the industrial revolution. when people had farms and worked farms, I think moving about was less common as well.
When the man was