Which innovative retail strategy did Merriam-Webster implement in 2010 that revolutionized their business model and helped them survive the digital transition?

The way we look up words has dramatically changed over the decades. From massive multi-volume dictionary sets to pocket references to digital innovations, language reference tools represent a fascinating study in product evolution. This poll tests your knowledge about how dictionary companies have adapted to changing technology and consumer needs in the competitive linguistics marketplace.

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They created a subscription-based app with premium linguistics features like etymology tracing and pronunciation guides
They made their complete dictionary freely available online, monetizing through ads and API licensing to tech companies
They partnered exclusively with Amazon to create Kindle-only interactive dictionaries with voice search capability
They pivoted to print-on-demand custom dictionaries where customers could select which language families to include