Timmy's logic (that human wants are infinite, so there will always be unmet human desires, so there will always be jobs) makes sense to me. Some people react to this in the predictable way: "oh, those sort of jobs
Speaking of evidence, of course, we could look to the past as our guide to the future. This isn't something you're going to do if you believe the-jobs-are-going-away because, errm, they haven't. The mechanisation of agriculture or spinning didn't lead to vast unemployment; neither did or will the death of coal; and so on. I twot that in the sure knowledge it was a killer reply. mt replied A big question is whether this pattern is some sort of inevitable law which is an advance of sorts, because the original certainty has now turned into a question. We could worry about AI, and indeed I might worry about real AI, but we haven't got that or anything close yet.
But then comes The main observational evidence is not that employment is shrinking but that it commands smaller wages. Which I think is Not True (but notice that it, too, is a retreat from the original assertion). To examine whether it is true or not you'd need to know whose wages you care about. In this context it is unlikely that mt cares about the global poor, who as we all know are rather less poor than they used to be (as JG helpfully interjects) but this does allow mt to clarify that his sympathy is for Deciles 8 and 9 (western middle class) are having great difficulties, which the graph shows somewhat2, 3.
At which point those not in the know need to know what graph is being talked about, and the answer is this or some variation thereon:
So, OK, there are two points below 0 on that curve, though one of them is so marginally below zero as to be indistinguishable from zero in any statistical sense. And of course, that's ending in 2008, which wasn't a happy year for the world economy. But to turn this into a general summing-up of "commands smaller wages" is not I think realistic. And indeed, here's another version, with a different end point, and a different conclusion in that detail:
The negatives have now gone. Rejoice.
Of course, the future might be different. After all
1. Not obvious to everyone, of course. Indeed vehemently denied by many people. Touched on in Why don’t people pay attention to the future of their own world? in 2017.
2. After this mt and JG wander off into what seems to me a rather odd discussion of "freedom" in the context of freedom to drop out, I think; I don't think that's profitable - to me it resembles the atavistic yearning for Ye Olde Dayes of Happy Peasants.
3. Aside: suppose it were for some reason true that the Western Middle Class were losing out from Globalisation, in the way shown by that graph or more so, but yet the global poor were benefiting as it shows. And that (for inexplicable hand-of-god reasons) you had to choose between that change, and a no-globalisation slight-increase-all-round: which would you choose? Would you choose your local, globally-rich WMC, thereby condemning the globally poor to yet more grinding poverty?
4. This is all a bit personified, but I think mt's views are representative rather than original in this context, so it isn't really personal.
* Ze Robots are comink
* In the mid 1980s, improved economic conditions for the middle classes led to a dramatic rise in tastelessness
* Paul Voosen: One more time: Despite what you’ve heard, leading cloud scientists are dubious that cooling marine clouds will simultaneously wink out at tripled CO2 levels (retwat by Gavin)
* The Philosophy of Poverty?: My Opening Statement by Bryan Caplan
* The wage decoupling mess by Scott Sumner
* Reflections on the Balan-Caplan Poverty Debate by Bryan Caplan
* Keep on Truckin’ With Economics by DON BOUDREAUX