Final answer:
The new total labor supply curve in the area after the arrival of group B is obtained by adding the labor supply curves of group A and group B.
Step-by-step explanation:
The new total labor supply curve in the area after the arrival of group B can be obtained by adding the labor supply curves of group A and group B. Group A has a labor supply curve of S_A(w) = 2w, and group B has a labor supply curve of S_B(w) = 2 + aw. To get the new total labor supply curve, we add the two equations:
S(w) = S_A(w) + S_B(w)
S(w) = 2w + 2 + aw
This gives us the new total labor supply curve in the area after the arrival of group B.