the following questions: (3 points) There are four types of market structure. Which market structure best represents the Portland Trimet? Your answer must base on the economic definition and characteristics of the market structure. (1 point) How Trimet's demand curve would look like? (Hint: think about the elasticity of the demand and the slope of the curve) (1 point) Is the marginal revenue equal to the price when selling one more unit of the product