The following graph input tool shows the marginal benefit $($MB$)$

$($MB$)$

and marginal cost $($MC$)$

$($MC$)$

curves for baseballs in an economy. At $20$ million baseballs, expected marginal benefits are equal to expected marginal costs, E$($MB$)=$E$($MC$)$

E$($MB$)$

$=$

E$($MC$)$

$.$

Use the graph input tool to answer the questions that follow. You will not be scored on any adjustments made to the graph input tool.