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Why can't private individuals always internalize an externality without the help of government?
Longitudinal Study
Research that follows the same subjects over a long period of time, collecting data at multiple intervals to observe changes or developments.
Monitoring the Future
A long-term study that tracks the behaviors, attitudes, and values of American secondary school students, college students, and young adults.
Research Design
The overall strategy that a researcher chooses to integrate the different components of the study in a coherent and logical way, thereby ensuring effective address of the research problem.
Positive Correlation
A relationship between two variables in which both variables move in the same direction, meaning that as one variable increases, the other one also increases, or as one decreases, the other does as well.
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