US election merchandise sales offer insight on presidential winners.

"[In] nine out of the last 11 elections. Our sales of the successful candidates’ [campaign merchandise] outpaced that of the candidates who lost in the elections,” Steve Ferber, co-owner of Lori Ferber Collectibles, told VOA Mandarin.

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"I think Trump merchandise was outselling the merchandise for Joe Biden 2-to-1. And amazingly, the day after the debate ended, that completely flopped in the other direction. And now we find that items that are promoting Kamala for president are outselling Donald Trump items 3-to-1."