Wine consultants have become essential to the production of Napa Valley's signature product: Cabernet Sauvignon. As more wineries rely on a handful of elite winemakers, the field has become more competitive. Senior wine critic Esther Mobley joins host Cecilia Lei, to explain how the economics of winemaking factor in and why some fear the wines could become homogeneous. | Unlimited Chronicle access: sfchronicle.com/pod

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