There are four main types of online retail business models: virtual merchants, omni-channel merchandisers (sometimes referred to as bricks-and-clicks or clicks-and-bricks), catalog merchants, and manufacturer-direct firms.

Find an example not mentioned in the text of "E-Commerce 2019, Business, Technology, and Society", each of the four types of online retailing business models. Describe each firm, and why it is an example of the particular business model.