I lucked out on finding definitions on line that were intuitive my little old brain. Sites tend to note that “services” are examples of non-traded goods, but that is not very helpul. Do they mean amenities like public services, or all services? It seems that services provided by mobile labor would be traded as the janitors or lawyers can easily move to another place. Or do they mean by “non-traded” that the consumer cannot trade what they get. I.e., I can resell an apple I buy on the market, but I cannot resell a haircut or banking services or legal advice (easily).
This UMich econ professor defines nontraded goods as:
I think a good example of this would be certain military goods that are illegal to export for national security reasons.
Tradability in this sense has to do with transportation. If it can be transported and sold it is a tradeable good and if it can’t it is not. A can of corn is a tradeable good, whereas a serving of corn in a restaurant is a non-tradable good. Services are another example because they can not generally be transported. A hair cut is a non tradable good and a pair of scissor is a tradable good since it can be moved.