Warren Buffett explains how Costco is dominating in one crucial area (COST)

Paul Morigi/Getty Images Warren Buffett sees Costco as a dangerous competitor in the retail space, due in large part to its explosive private-label brand Kirkland. In an interview with CNBC, Buffett citedKraft Heinz's 2018 sales of $26.3 billion, compared to sales by Costco's Kirkland brand, which reached $39 billion. "Here [Kraft Heinz] are, 100 years plus, tons of advertising, built into people's habits and everything else," Buffett said. "And now, Kirkland, a private label brand, comes along ...