The thing is, that marriage (Marriage 1.0) of say 50 years ago, is not the same as marriage today (Marriage 2.0). The laws and societal norms are different. S

The thing is, that marriage (Marriage 1.0) of say 50 years ago, is not the same as marriage today (Marriage 2.0). The laws and societal norms are different. So it is not clear then, if the incentives to be married have changed (I think they have, based on my observation); if some part of the "math" is different, then, that would explain why the marriage rates are different.