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.
According to the the national occupational survey conducted by the BLS each year, marine engineers and naval architects brought home an average annual salary of $91,730 as of May 2011. The average wage for this occupation was $44.10 per hour.The BLS further reports that half of all marine engineers and naval architects working in the United States made between $30.99 and $53.06 an hour, and between $64,460 and $110,370 a year.he BLS further reports that half of all marine engineers and naval architects working in the United States made between $30.99 and $53.06 an hour, and between $64,460 and $110,370 a year.