At a price of $5, consumers buy 200 units of good X. When the price falls to $4, quantity demanded increases to 250 units. We can conclude that over this range, demand is:

What is a likely explanation for why the budget of a government agency might increase beyond its optimal size?

A. The paradox of voting B. The influence of the median voter C. The power of special-interest groups D. The allocative efficiency of government

Which of the following countries had the worst score in the Corruption Perception Index in 2012?

A. Italy B. China C. Mexico D. Russia