ECO 204 Week 2 DQ 2 Externalities Externalities. Explain the difference between a positive and negative externality. In your analysis, make sure to provide an example of each type of externality. Why does the government need to get involved with externalities to bring about market efficiency? What solutions need to be provided for your xamples? Guided Response: Review the discussion board posts of your classmates. What are some of the key differences between positive and negative externality? Respond to at least two of your classmates. Analyze the solutions your classmates offered and compare them to your own. Provide advice to your classmatesÂ’ solutions for making the market more efficient.