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The price of the managerial-economics textbook Managerial Economics Made Easy by Professor Hyde has increased. Assume the market for managerial economics textbooks is perfectly competitive. Which of the following could NOT explain the price increase? O a new managerial economics textbook Managerial Economics Matters by the world famous economist Dr. Jekyll has been published. O the price of other managerial economics textbooks has increased. O enrolments in managerial economics courses has increased. O the author of Managerial Economics Made Easy, Professor Hyde, negotiates a new contract that requires the publisher to pay him a higher royalty per copy sold. O there has been a decrease in the supply of the type of paper used for Managerial Economics Made Easy