As furniture and home goods sales have moved online, retail experts told me, more and more stores have sought a piece of the action. But instead of sourcing or creating their own products, many large retailers have relied on overlapping networks of manufacturers, distributors and third-party sellers — creating a baffling (and frankly, shady) shopping environment where many sites sell identical or near-identical items under different names and at wildly different prices.

A few different trends are at play here, and it’s sometimes difficult to know exactly which one you’re witnessing. When I first began looking into this phenomenon two years ago,1 I assumed my lamp and its many, many twins were the obvious product of white-labeling — a popular and growing practice in which competing retailers purchase the same generic product from a single manufacturer, then market it to consumers under different brand names.

This is likely true for many doppelganger products — but certainly not every one. George John, a marketing professor at the University of Minnesota, told me the furniture and home goods industries also have a long-time affection for a technique called “branded variance,” wherein they create slightly different versions of the same item for different retailers.

Among the most eye-opening details in this article, about one-fifth of the value of U.S. online orders are returned every year. That is an enormous amount of waste — potential and realized.