The eyeglass maker plans to go public though a direct listing.

Warby Parker was one of the original direct-to-consumer brands, but now, the eyeglass-maker’s sales are split about evenly between its more than 140 brick-and-mortar locations and its online store. WSJ’s Charity Scott explains why this split is Warby Parker’s secret sauce. Photo: Adam Falk/The Wall Street Journal

The Economics Of
How do the world's most successful companies generate revenue? In this explainer series, we'll dive into the surprising stories behind how businesses work--exploring everything from Costco's "treasure-hunt" model to the economics behind Amazon's AWS.

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