According to a) milton friedman b) friedrich von hayek c) adam smith, self-interest and competition act as a) an invisible hand b) a motivator c) a regulator, guiding firms in a market based economy

What was the midwest states often called because they were located in the center of the nation

Music the height of a wave or the amount of the wave carries is the amplitude. a. air b. nodes c. speed d. energy

Suppose you are a freshmen in college and you have not declared a major. one reason you enrolled at your respective college was the school's vibrant social life. at the same time, you want to balance your academic life because you know that your grades will matter for graduate school or job applications. you decide to forgo partying for two hours to study for an upcoming economics exam. in your first semester's principles of economics class, you learn that the enjoyment you would have received from partying is an example of a(n)