I want a ham sandwich, but I'm only able to spend $3 on it. I walk down the street looking for someone willing to sell a sandwich to me for that price.
Jill sells ham sandwiches but wants $5.
Ben was selling them for $3 but is out now.
Sue sells watches.
Mitch is homeless and doesn't even have a store.
Which of these people - possibly more than one - is
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