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 BLS lists marine mechanics under the job category of Motorboat Mechanics and Service Technicians. The average pay nationwide was $37,430 a year as of 2013. Because marine mechanics work mostly at docks and marinas, the largest number of jobs are in states located near large bodies of water.onnecticut was the state with the highest average yearly salary, at $47,060. New Jersey ranked second at $46,160. The biggest employers were boat dealers, which paid an average of $36,770 a year.