You're right that assessing a model like that is perfectly legitimate, but all the models you mention are much more limited and well-understood than multiple se

You're right that assessing a model like that is perfectly legitimate, but all the models you mention are much more limited and well-understood than multiple sectors of the economy. The original post in this chain claimed "a good chunk" of the modern economy was net-negative. I don't believe we make similarly hard to quantify calculations every day. It's also important to note that all the examples you give have a lot more data supporting them than any of these internet comments. If the original poster actually built a model of a "good chunk" of the economy and proved it was net-negative and zero-sum I wouldn't have been dismissive.