This week, Ira spoke with David and Susan Schwartz, authors of "The Joy of Costco: A Treasure Hunt from A to Z." In this low-price but quality episode of “Ira’s Everything Bagel,” David and Susan talk about why they decided to write the book as a couple; Costco’s business model; strategies for buying holiday merchandise and food there; the importance of the culture of the company; and how their book, in a whimsical A to Z format, covers topics ranging from chicken and eggs to more serious topics like Costco’s code of ethics, sustainability and good works.