Consider the following statements regarding the economic pricing model: I. The economic model is limited in use because a firm's demand curve is difficult to determine.
II. The marginal revenue and marginal cost model is valid for all forms of market organization (perfect competition, oligopoly, and so forth).
III. Cost accounting systems are not designed to measure the marginal changes in cost incurred as production and sales increase.
Which of the above statements is (are) true?
A. I only.
B. III only.
C. I and III.
D. II and III.
E. I, II, and III.

while setting up his new office, an attorney ordered thick, frieze carpets for the floor. however, the building inspector had him remove the expensive carpeting. the building inspector stated that according to federal regulations, the office must be wheelchair accessible as it is a public area. he further explained that since wheelchairs do not maneuver well in thick, frieze carpeting, the carpets had to be removed and be replaced with smooth-textured carpets that do not restrict wheelchair maneuverability. this scenario illustrates how a company is influenced by the component of its specific environment.

The hartman family is saving $400 monthly for ronald's college education. the family anticipates they will need to contribute $20,000 towards his first year of college, which is in 4 years .which best explain s whether the family will have enough money in 4 years ?

In north korea, a farmer’s income is the same as a dentist’s income. in a country with a mixed or market economy, the difference between those two professions might be more than 5 times different. how can you explain the fact that individuals doing the same work in different countries do not earn comparable salaries?