In "From Barter to Bitcoin," the author notes that people in different parts of the world have used salt, cacao beans, and seashells as currency at various times.
What conclusion can be logically drawn from this detail?
People who used such common things as currency would have been better off bartering.
People in these places and eras had more salt, cacao beans, and seashells than they knew what to do with.
These things were considered to be valuable by people in those places and at those times.
These things are valuable enough that many people today continue to use them as currency.