Excellent point.
I’ve said before that I have no problem with restaurants serving smaller portions - it’s part of our obesity problem that portions are so big.
However, economics usually takes the lead and I can’t see spending only a dollar less but getting half the food for a smaller portion size.
Right, I still see restaurants selling upsize portions (no half order available) so they can charge more. I go to these places maybe once every couple of months now and generally take some home.