New comment by JayNeely in "Why Salt Was So Important Throughout History"

I'd encourage you to expand the book-promoting paragraph to include a bit more info / some interest-generating hooks about what the book offers that the article itself hasn't already provided.

If you really want to make this model sustainable long-term I might even make the recommendation paragraph dynamically customized based on referring source (here's a WordPress plugin that would let you do this: https://wordpress.org/plugins/if-so/). History enthusiasts are likely to be intrigued by a different set of things from the book than HN's business & systems-thinkers or an RPG community interested in world-building inspiration.

Lots of people will read a general-interest article (quick & no cost), but to get conversions to an actual sale, you need to target specific interests.

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