I asked my "Introduction to Family Life" class to consider the costs and benefits of the most common type of family - a married couple and their children - and the several major variants that we studied. They did a good job considering the costs and benefits of the variants. On the most common type, though, several of them came to this considered judgment (I am quoting from one exam):
There are not real costs to marriage and a two parent household, there are only benefits.
I was taken aback by this. Not really because I disagree, but because I am used to thinking that all arrangements have costs as well as benefits.
I would be interested in your thoughts on this question and answer.