Costco CEO Ron Vachris sat down with The Wall Street Journal to discuss how its $86 billion Kirkland Signature brand runs and why it allows Costco leverage over many big brands. Photo illustration ...

Costco has mastered the impulse buy. Shoppers pop in for eggs or rotisserie chicken only to wheel out baskets piled higher ...

Before she knew it, she was the proud new owner ... Costco into the world’s third-largest retailer behind Amazon and Walmart. “People come in to spend $100 and walk out with $300,” CEO ...