Is there a comma in the following statement, at the end of this sentence? (shelly joyfully said)

Which of the following statements is true of the balanced-scorecard? a. it is a more or less a one-dimensional metric of measuring competitive advantages of a firm. b. it is one of the traditional approaches of measuring firm performance. c. its primary focus is to base a firm's strategic goals entirely on external performance dimensions. d. it attempts to provide a holistic perspective on firm performance.

Which of the following situations is most likely to change a buyer's market into a seller's market? a. a natural disaster that drives away a lot of the population. b. the price of building materials suddenly going up. c. the government buys up a lot of houses to build a new freeway. d. a factory laying off a lot of workers in the area.

John has been working as a tutor for $300 a semester. when the university raises the price it pays tutors to $400, jasmine enters the market and begins tutoring as well. how much does producer surplus rise as a result of this price increase?