Refer to Table 21.1. What is the mean income on Richlandia?

Which of the following is not generally considered one of the three main causes of the financial crisis of 2007-2009?

A) insufficient regulation of the shadow banking system B) excessive risk taking by commercial banks and other financial intermediaries C) the "too-big-to-fail problem" of large financial firms D) inaction by the Federal Reserve in acting as lender of last resort

Baumol and Blinder argue that oligopolies are interdependent firms. What do they mean by this? Give three examples of the types of interdependence which might occur