A negative externality is an activity that imposes a negative effect on an unrelated third party, while a positive externality is the positive effect an activity imposes on an unrelated third party. $$Match the following with positive or negative externality.

Prompt $1$Posting match by match results of a wrestling tournament to my Twitter account so wrestlers' parents can see them

Answer for prompt $1$ Posting match by match results of a wrestling tournament to my Twitter account so wrestlers' parents can see them

Prompt $2$Homeowner spending $$7,500$ in landscaping improvements to their property in hopes of increasing the market value of their home.

Answer for prompt $2$ Homeowner spending $$7,500$ in landscaping improvements to their property in hopes of increasing the market value of their home.

Prompt $3$Installing scrubbers on a power plant smokestack even though the people in range pay nothing towards their cost

Answer for prompt $3$ Installing scrubbers on a power plant smokestack even though the people in range pay nothing towards their cost

Prompt $4$Open pit mining where some tailings enter groundwater

Answer for prompt $4$ Open pit mining where some tailings enter groundwater

Prompt $5$Reducing the level of CO$2$ emissions in my country even if other countries do not do the same

Answer for prompt $5$ Reducing the level of CO$2$ emissions in my country even if other countries do not do the same

Prompt $6$Driving home after five beers at the local pub

Answer for prompt $6$ Driving home after five beers at the local pub

Prompt $7$Adding more nitrogen to my continuous corn crop $($eschewing a soybean rotation$)$ which results in nitrogen runoff

Answer for prompt $7$ Adding more nitrogen to my continuous corn crop $($eschewing a soybean rotation$)$ which results in nitrogen runoff

Prompt $8$Beekeeper who keeps bees for their honey while the bees pollinate surrounding crops.

Answer for prompt $8$ Beekeeper who keeps bees for their honey while the bees pollinate surrounding crops.

Prompt $9$Adding more cattle to the open savannah

Answer for prompt $9$ Adding more cattle to the open savannah