Wages in the United States vary in every state, because each state has different minimum wages, but the best to my knowledge wages are determined and priced for every field profession and its factors. Since a chief executive is more involved in creating strategies and making sure the maximized profit is being produced and gained for their company, and a Scientist is primarily factor is to create and maintain new advances so that the government and taxpayers can continue funding their program. I believe this is why an executive earns more than a rocket scientist
Is it possible you might revisit your thought on wage rates, and point out the places where marginal revenue product is the main determinant? Might that be, all of them?