Why are utilities, such as electricity and water, examples of natural monopolies?

For each of the following examples of data, determine which scale of measurement is used. a) the number of miles joggers run per week. b) the starting salaries of graduates of mba programs c) the months in which a firm's employees choose to take their vacations. d) the final letter grades received by students in a math course.

According to the law of supply,suppliers want to sell their product at prices

Characteristics of substistence farming include all of the following except a. the use of pesticidesb. shifting cultivation c. farmers that stay in one placed. the lack of tractors and machinery