Consider the following statements about why prices are often based on product costs: I. Companies sell many products and services, and cost-based approaches provide a simple and direct pricing method. II. The cost of a product or service provides a lower limit or floor, below which price should not be set in the long run. III. Determining a company's demand and marginal revenue curves is difficult, costly, and time consuming. Which of the above statements is (are) true

Power plants that rely on coal increase the amount of sulfur dioxide that dissolves into the air, eventually increasing the acidity of precipitation. the higher acidity of rain and snow can damage forests by making it more difficult for plants to absorb minerals from the soil. the equations below provide information about the market demand and supply of electricity. there is a constant marginal external cost of $25 per unit of electricity. d: qd= 200 – 2ps: qs=p – 10what quantity of electricity satisfies allocative efficiency in this market? a. 60b. 70c. 50d. 43.3