The "Big Four" accounting firms (Deloitte, EY, KPMG, and PwC) are coined the "Big Four" due to their market dominance in the audit and tax market in the United States. Pick ONE of the four questions below:

1. What type of chart would you use to show which accounting firm dominates in each state in terms of audit revenues?

2. Would you use the same chart for tax revenues?

3. What other ways would you recommend to these firms in finding untapped opportunities within the audit and tax market?

4. Should the firms continue to stay focused on only audit and tax, or should they explore other areas of opportunities?