Which innovative retail practice did Harry Gordon Selfridge introduce when he opened Selfridge's department store in London in 1909 that broke with British retail tradition?

Test your knowledge about the fascinating history of department stores and how they revolutionized retail! These commercial palaces transformed shopping from a necessity into a leisure activity and helped create modern consumer culture. From humble beginnings to grand emporiums, department stores have a rich history of innovation in merchandising, customer service, and retail psychology.

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Displaying merchandise openly so customers could examine items without assistance
Introducing the first escalator in a retail establishment
Creating the first restaurant inside a department store
Establishing the first store credit card system