Use the following to answer questions:
Figure: Traffic Lights in Plymouth 
-(Figure: Traffic Lights in Plymouth) Look at the figure Traffic Lights in Plymouth. Plymouth has 1,000 residents. Each of the residents has the same individual marginal benefit per traffic light. If the town's population doubles and the new residents share the identical individual marginal benefit of the existing residents, the socially efficient quantity of traffic lights will:
Definitions:
Academic Problems
Issues or difficulties encountered in the educational context, ranging from learning disabilities to struggles with academic content.
Behavioral Problems
Indicates actions or attitudes displayed by individuals that are deemed socially unacceptable or inappropriate.
Lead
A heavy metal that is toxic to humans, exposure to which can cause serious health problems, especially in children, affecting their development and cognitive functions.
Intelligence Scores
Quantitative measures of a person's cognitive abilities, often determined through IQ tests.
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