Please help me answer case 7. thanks. Based on game theory of economics

Case 7: In the attached table are some data on the compensation of the executives of a certain company. The rst column contains the \"command" levels in 8 ordered groups (3 corresponds to the "top\" executive and 1 to the lowest executive level); the second column contains the number of executives in each group; and the third column details the average salary of the executives of each group. Note the existing salary differences and present a reasonable explanation for them. EXECUTIVE SALARIES Scale of command Number of executives 3 Average salary {in SE} 1 502,000 '1' 3 328,000 6 14 165,000 5 56 1 15,000 4 5?4 69,000 3 319 49,000 a... 839 40,000 1 944 33,000