This article is about the Economist's summary of a journal article so we have a (AI?) summary of a summary. Not very helpful. Here are a couple of better references:
Ok, we'll merge the current thread into https://news.ycombinator.com/item?id=49357530, which is one hop closer to the source. I'll put the link to the paper in the toptext there as well.
https://papers.ssrn.com/sol3/papers.cfm?abstract_id=6868618
https://archive.is/w1eng
Also note the findings are more nuanced than may appear on the surface.
Thanks!