Which revolutionary pricing strategy did Merriam-Webster use in the 1950s that dramatically expanded dictionary ownership in American households?

Dictionaries are essential tools in language learning and linguistics, but their pricing strategies have evolved dramatically over time. From premium leather-bound editions to free digital access, publishers have had to adapt to changing markets and technologies. This trivia question explores a fascinating pricing innovation that changed the dictionary market forever. Test your knowledge about the business side of linguistics!

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Offering dictionaries as free supplements with newspaper subscriptions
Selling dictionaries through school fundraising programs at discounted rates
Introducing the 'grocery store dictionary' sold in supermarkets for less than $1
Creating a monthly dictionary subscription service with installment payments