A group of herders share a common parcel where they can graze their cattle. The productivity of the land depends on the

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A group of herders share a common parcel where they can graze
their cattle. The productivity of the land depends on the level of
grazing. The price of milk is assumed to be $0.65 per gallon and
the annual costs associated with milk production are $500 per cow.
Each herder owns 50 cows.
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Calculate and report the missing entries (i.e. the average milk
production; marginal milk production; Total annual revenues; and
Average revenues)
What is the efficient number of herders grazing their cattle on
this parcel? Provide a reason for your answer.
How many herders will graze their cattle if they have open access
to this parcel? Provide a reason for your answer.
Environmental community leaders advocate for a permit system where
each herder is charged a fixed amount every year. How much should
each herder be charged per year in order to secure that the
efficient number of herders graze their cattle on this parcel?
Provide a reason for your answer.