
eBay: the cleanest early case of a pure marketplace take rate.
Cohen wrote the first substantial history of eBay, covering Pierre Omidyar's founding of AuctionWeb in 1995, the growth of the community, the arrival of Meg Whitman as chief executive, the initial public offering, and the company's development through about 2001.
The substantive material concerns the community and trust systems. eBay's central problem was that strangers had to transact without any mechanism for enforcement, and the feedback rating system was the answer: a public record of counterparty behaviour that made reputation a transferable asset. Cohen documents how the system was designed, how it was gamed, and how eBay repeatedly had to decide whether to intervene in disputes or leave them to the community. He covers the site outage of June 1999 that took the service down for twenty-two hours and the infrastructure investment that followed, the tension between the original community of collectors and the commercial sellers who arrived later, and the decisions about which categories to prohibit.
The business model is the other useful element. eBay charged listing and final value fees and held no inventory, which produced margins no retailer could match and growth constrained only by the number of transactions, and Cohen shows how unusual that was in the period when every other e-commerce company was buying warehouses.
The book is from 2002 and predates PayPal's acquisition, the shift to fixed-price listings, the competition from Amazon marketplace and the decline in eBay's position. The trust system material is the part that transfers.
Founders building marketplaces who want the origin of reputation systems and the economics of an inventory-free transaction business.
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