Which innovative loyalty program feature did Shakespeare & Co. bookstores introduce in 2019 that revolutionized personalized book recommendations?

In today's competitive publishing market, bookstores and publishers are increasingly turning to loyalty programs to retain customers and boost sales. These programs have evolved significantly in the digital age, offering unique benefits to avid readers while gathering valuable data for retailers. Test your knowledge about how the literary world has embraced customer loyalty strategies!

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The 'Reader's Algorithm' that analyzes previous purchases and reading speed to create AI-driven personalized recommendations
The 'Literary DNA Test' where customers submit saliva samples to receive genetically-compatible book suggestions
The 'Book Match Dating Service' pairing readers with compatible reading partners based on literary preferences
The 'Subscription Box Voting System' where loyalty members collectively vote on which books will be featured in monthly boxes