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Excellent article, but I was completely overthrown by the use of the word "ain't" (with an apostrophe, too). Quite atypical of The Economist.

"It ain't necessarily so" is a common turn of phrase (also a song), which the author was playing off.

I'm not sure what crazed style nazi is downvoting you for being informative. It's a common reference.

Why? It's a perfectly cromulent word.

Nice reference