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'Tis the Season Puzzler

Which markets exhibit this kind of trend in Google searches?

Note: the graph shows not just an upward heartbeat spike each January but a marked depression in November and December.
Here’s?a (self-promotional) hint.
Can you conjure a?Google trend with a countercyclical pattern (that is, with elevated searching before the New Year but lower than average levels in January)?
(HT:?Joshua Gans)