How Amazon Prime Compares to These 3 Leading Membership-Based Businesses

E-commerce juggernaut Amazon.com (NASDAQ: AMZN)dropped a bombshell disclosure last night: It now has over 100 million Prime members. That's a massive global member base of customers that pay Amazon for the privilege of shopping on the site, enjoying a growing collection of benefits, most notably free two-day shipping.

While it's hard to figure out exactly how much revenue Amazon is bringing in from Prime membership fees, since members are located all around the world and pay varying fees based on geography, it's clear that Prime is one of the most successful membership programs ever.