Look up the term “negative externality” How does this apply to the pig farmers that we discussed earlier?

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How does this apply to the pig farmers that we discussed earlier?  
What kinds of externalities have come from CAFOs (Concentrated Animal Feeding Operations)
Does the cost of pork, beef, chicken, etc. reflect these externalities?
What does this have to do with your personal ecological footprint?

video on youtube : Externalities: When Is a Potato Chip Not Just a Potato Chip?