Final answer:
Competition between two major parties helps create balanced public policy by promoting debate, encouraging moderate positions, and acting as a check on the major parties.
Step-by-step explanation:
The competition between two major parties in the political arena helps create balanced public policy in several ways. First, it promotes debate and critical analysis of different policy proposals, leading to a more thorough examination of the potential benefits and drawbacks of each. Second, when parties compete for votes, they often have to appeal to a broad range of voters, which encourages them to adopt more moderate positions that can attract a larger portion of the electorate. Finally, the presence of third parties can act as a check on the major parties, pressuring them to address specific issues or reach compromises in order to maintain their voter base.