The model described in Question $9$ has been implemented in GMPL$/$GUSEK$.$ Decision

variables were created to represent area harvested $($ha$)$ from each of the two stands in each

of the two periods. Accounting variables were created to represent the harvest volume in

each of the two periods. The input and output files are presented below.

a$.$ In what units should the shadow price for each of the five constraints be expressed?

b$.$ There is no volume harvested from stand A in the second period in the optimal

solution. All other things being equal, what would the second period yield for stand

A need to be before the optimal solution would include some second period harvest?

Explain your answer briefly.

c$.$ All other things being equal, what would the optimal harvest volume be if the

available area in stand B was increased to $300$ ha$?$ Explain your answer briefly.