Based on the article "megaships not good for economies of scales" https://gcaptain.com/study-megaships-not-good-for-economies-of-scale/, answer the question below:
a. What is the size of a vessel within which it enjoys economies of scale? Use diagram to illustrate these economies of scale.
b. Discuss the reason why economies of scale disappear once if a ship is bigger than the size mentioned in part (a).