AVERAGE PRODUCT AND MARGINAL PRODUCT: 1  If the marginal is less than the average, then the average declines. 2  If the marginal is greater than the average, then the average rises. 3  If the marginal is equal to the average, then the average does not change. If the productivity of the marginal worker is equal to the average productivity of the existing workers, then the average does not change. 2  Marginal Less Than Average: Once the marginal product curve moves below the average product curve, then the average product curve declines.
Marine Engineer or Naval Architect Salary. (United States). Median pay for Marine Engineer or Naval Architects in the United States is around $84K annually. In the world of Marine Engineer or Naval Architects, total cash compensation can vary between $55K and $147K.arine Engineer or Naval Architect Salary. (United States). Median pay for Marine Engineer or Naval Architects in the United States is around $84K annually. In the world of Marine Engineer or Naval Architects, total cash compensation can vary between $55K and $147K.
The average annual salary of sailors and marine oilers in 2010 was $38,030. The bottom 10 percent of these merchant seamen had an average annual salary of $22,320, and the bottom fourth had an average annual salary of $28,100. The middle half of sailors and marine oilers earned salaries averaging $36,260.he middle half of these merchant seamen earned an average of $64,180 per year. The top quarter had annual salaries of $91,750 per year and the average salary of the top 10 percent was $117,310 per year. The average annual salary of engineers in the merchant marine was $70,920 per year in 2010.