Could Amazon’s secret to revolutionizing logistics be the willingness to say yes?

It is now widely recognized that Amazon ushered in a new era of logistics with its Prime two-day delivery service. The program not only changed the e-commerce game, even accelerated it, but it has infiltrated nearly every aspect of shipping today. Businesses now expect shipments in a timely manner. Transportation companies have had to adjust their scheduling to meet these demands.

It’s likely not an overstatement to say Jeff Bezo’s plan for two-day shipping changed the world. But, how did it come about? There are many theories, and plenty of insiders that can tell the full story. One of those is Doug Herrington, CEO of Worldwide Amazon Stores. Harrington sat with National Retail Federation CEO Matthew Shay last month for a discussion on Amazon at the NRF’s Big Show in New York City.

While Herrington discussed many issues during their nearly 45-minute conversation, there was a theme throughout about the way Amazon works internally that leads to the many innovations—both successful and not successful—it rolls out regularly.