idk, citation needed.
Plenty of people I've met had pretty finite wants. A lot of people really are very happy with their small apartment in the city, going to work, doing misc recreation, and then drinking a bit. They don't need a Rolls-Royce or a couple of yachts.
A big problem with the argument that everybody wins from trading is that sure a pair of countries can go from 5 apples and 5 pears combined to 10 apples and 10 pears combined but what happens when there's only demand for 8 apples and 8 pears? People don't work as much.
Perhaps a 50 year old longshoreman can be retrained to install solar panels or w/e. But I suspect much more they'll find an early retirement or a greeter job somewhere and the up and coming 18 yr old will install solar panels and the labor stats will show a decrease in longshoreman and an increase in installers even if the population isn't transferring between them.