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Maybe you read a “shelf talker,” one of those tags that hang around a bottle’s neck or on the shelf next to the price tag, bragging about a critic’s score.

Take, for example, one shelf talker created by Bob David, a sales associate at chain store Total Wine & More’s West Orange, N.J., location.

The Whitehaven was the only wine I bought based on a face-to-face exchange and not a shelf talker—although in the case of Mr. David and the $10 Cabernet, I guess it was both.

A shelf talker may be a “silent” salesperson, but the live version is still the very best kind of all.

That’s where a good shelf talker is useful.