What are the relevant product markets? How concentrated is each market, and who are the competitors? What are the barriers to entry for each market? 100%. Entry is difficult for the same reasons as for international long distance services. What are the barriers to entry in this market? How difficult are these barriers to overcome? Are marginal costs high or low in this industry? What does this indicate about the market power of the firms? In addition to approving (or opposing) the merger, what role does government regulation play in this industry? What are the relevant product markets? How concentrated is each market, and who are the competitors? What are the barriers to entry for each market? 100%. Entry is difficult for the same reasons as for international long distance services. What are the barriers to entry in this market? How difficult are these barriers to overcome? Are marginal costs high or low in this industry? What does this indicate about the market power of the firms? In addition to approving (or opposing) the merger, what role does government regulation play in this industry