How many people could be inside the Amazon funnel? Basically anyone. Not only does Amazon offer a mind-boggling number of products, but it also offers a broad array of highly desirable personal and business services, including cloud hosting and fulfillment. In addition, Amazon’s platform that is so technologically advanced that it allows almost an infinite number of people to be in the platform at any given time.
In marketing automation, Ryan Deiss, co-founder of Digital Marketer, often describes the sales funnel as a multi-step, multi-modality process that moves prospective browsers into buyers. It's multi-stepped because lots must occur between the time that a prospect is aware enough to enter your funnel, to the time when they take action and successfully complete a purchase.