$($Follow$-$up question about Bass Pro Shops$)$Suppose production output for Bass Pro Shops is measured as the number of customers served by hour. Imagine there are three categories of employees, which include $(1)$ cashiers, $(2)$ product outfitters, and $(3)$ stocking associates. At current staffing levels, the marginal products of labor for each of the categories are $40$ customers for cashiers, $15$ customers for product outfitters, and $10$ customers for stocking associates. The hourly wages are $$18$ for cashiers, $$22$ for outfitters, and $$16$ for stocking associates.$($Question$)$ Yes or No$?$ Does it appear that Bass Pro Shops has reached the optimal staffing levels for each worker category? If "yes," explain why. If$"$no$,"$ explain how Bass Pro Shops can improve the efficiency of its staffing levels.