If price decreases by 10 percent and quantity demanded increases by 30 percent, the price elasticity of demand will be

Assume the U.S. population is 300 million. If 200 million people are of working age, 125 million are employed, and 15 million are unemployed, what is the size of the labor force?

A) 200 million B) 125 million C) 175 million D) 140 million E) 215 million

A negative externality

A) occurs under any undesirable event. B) occurs when an action doesn't take into account the costs it imposes on others. C) can be a natural phenomenon, such as being struck dead by a bolt of lightening. D) cannot occur at the same time as a positive externality.