> It's obviously not a hypothetical that customers have preferences between different sources when they're actually provided with that information, or those preferences affect the sales of each supplier.

I suppose we have to agree to disagree: I see no evidence of the specific claim of yours that customers have a preference for specific individuals picking fruit (or whatever).

A specific brand? Sure. A specific niche (free-range, whatever), sure. A specific individuals labour? Yeah, I'd need to see some evidence for that!