Simon owns land along the shore of Lake Michigan. The table below describes the marginal benefits to tourists of recreating along his property (per person who has access for a day), as well as the marginal costs to Simon of more people getting access to the shore (due to litter, noise, and seeing other people on the shore).

(a) If Simon could not limit access across his property to the shore or otherwise limit or influence tourists' behavior, how many people would go to the seashore? (Fractions of people cannot exist. Give a whole-number answer.) Explain your answer.
(b) What is the efficient number of people to use Simon's shore? (Fractions of people still cannot exist. Give a whole-number answer.) Explain your answer.

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No. People MB, People 50 0 80 60 4251 10 30 -60 MC, S 1 2345 679 10 10 20 30 450 60 70 80 100 125