Which retail innovation first made dictionaries widely affordable to the average American household in the 1950s?

The way we access language resources has transformed dramatically over the decades. Dictionary companies have had to innovate their retail and distribution strategies to stay relevant in a changing world. This trivia question explores a pivotal moment in how dictionaries were marketed and sold to the public, changing their accessibility forever. Test your knowledge about the business side of language resources!

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Subscription-based dictionary services delivered monthly by mail
Supermarket sales of abridged Merriam-Webster dictionaries, priced at $1.99 with grocery purchase
Dictionary rental programs through public libraries with option to purchase
Door-to-door encyclopedia salespeople who offered free pocket dictionaries as incentives