Costco opened its first warehouse 40 years ago in Seattle.
The decades since have seen the retailer expand exponentially, and today, there are 871 Costco warehouses worldwide.
But amid the success and growth of Costco, certain myths about the retailer and its over 100 million members have also surfaced. And according to Costco superfans David and Susan Schwartz — who cowrote a book about the chain — not all of them are true.
In an interview with Business Insider, they debunked the biggest myths and misconceptions associated with Costco.