Positive externalities are created when
A) other consumers reduce their demand for coffee and price thereby declines.
B) farmers spray pesticide in their fields and it washes into the local river after the first rainstorm.
C) your neighbor plants beautiful trees and flowers in her yard.
D) you purchase the Mona Lisa and lock it in a vault.
Question 2
Students who talk loudly with each other in class
A) create an externality because other students cannot follow the lecture as well.
B) disturb nobody.
C) benefit the other students in class because they engage in conversation.
D) only create an externality if they talk about something unrelated to class.
A positive feedback loop.
Gram positive S. pyogenes bacteria in chains.
Positive and Negative Stereotypes
The Mantoux tuberculin skin test. Positive reaction.
Created Equal: A Social and Political History of the United States, Brief Edition
Mechanisms of positive control of transcription