It's also true for holidays. If you go alone you usually have to pay a single supplement to make up for the fact that you'r not a couple taking the room/cabin/apartment.
I'm not sure I agree with the psychologists that the family is no longer needed to survive. Family can be friends as much as blood relations. I don't think anyone can live in total isolation, it tends to mess with the mind. :)
Also true. But now it is still easier to live alone than it was 100 years ago:) but more expensive:)
I don't know if it's easier to live alone now rather than 100 years ago, I don't think living alone is ever 'easy'. I've done it and it's an extremely lonely existence. You're right, it is definitely less expensive to live with someone than it is to live alone! :)