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.
Sailors and marine oilers on the lower end of the salary scale earned $21,640 per year, and those on the higher end of the salary scale earned $55,360 per year. The industry that held the highest level of employment for sailors and marine oilers was inland water transportation, where salaries averaged $36,100 per year.hey also stand watch and steer the ship and have other duties. Marine oilers assist engineers and perform duties such as lubricating gears and reading temperature and pressure gauges. As of 2009, these merchant mariners averaged $17.94 per hour, and their average annual salary was $37,310, according to the BLS.