positive consumption and negative production externalities

Question 1

NE in production

Answer 1

cost to 3rd parties as a result of action of producer(airplanes cause pollution)
price is too low
over production
MSC > MPC

Question 2

PE in consumption

Answer 2

benefits to 3rd parties as a result of the actions by consumers(healthcare)
MSB > MPC
under consumption
misallocation of resources as people ignore the external benefits