\[ \begin{array}{|l|l|} \hline \textbf{Positive Externalities} & \textbf{Negative Externalities} \\ \hline \text{Provide benefits to uninvolved third parties.} & \text{Inflict costs on uninvolved third parties.} \\ \hline \text{Result in under-consumption in free markets.} & \text{Result in over-production or over-consumption in free markets.} \\ \hline \text{Examples: Education, Vaccination.} & \text{Examples: Pollution, Traffic Congestion.} \\ \hline \end{array} \]