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Anybody know why this article has a byline?

I believe it's because it's from The World Ahead issue, which iirc always has bylines unlike the normal weekly paper.

Articles generally should have those. It is incredibly suspicious when they don't.

The Economist doesn't include bylines as a rule. As your sibling comment pointed out, they do in these special editions.

That may be true, but it is still to the discredit of The Economist.