Which of the following did NOT play a role in keeping Greece from defaulting between 2010 and 2012?

When using the traditional command-and-control approach to environmental regulation, the government attempts to

a. set a minimum requirement and then allows the firm to determine the most efficient method for achieving this requirement b. determine the most efficient method for different industries c. make allowances for differences across industries and between firms d. set engineering standards that are applicable to all situations and does not recognize unique circumstances e. set a maximum requirement and they allows the individual firm the latitude of choosing the most efficient method

Consider two industries, industry W and industry X. In industry W there are five companies, each with a market share of 20% of total sales. In industry X, there are six companies. One company has a 50% market share and each of the other five firms has a

market share of 10%. a. Calculate the four-firm concentration ratio for each industry. b. Calculate the Herfindahl-Hirschman Index (HHI) for each industry. c. What do the values of the two concentration measures imply about the degree of market power in the two industries?