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While waiting in line to buy one cheeseburger for $1.50 and a medium drink for $1.00, Sally notices that she could get a value meal that contains both the cheeseburger and medium drink and also a medium order of fries for $2.75. She thinks to herself, "Is it worth the extra 25 cents to get the medium fries?" To an economist, Sally's decision is an example of
Secure Base
One of the three purposes of the attachment system. The bond between infant and caregiver provides the infant a protective resource as she develops and learns.
Late Adolescence
A phase of adolescence, typically from ages 15 to 18, characterized by further development of identity, cognitive abilities, and nearing physical maturity.
Longitudinal Studies
Research methods that involve repeated observations of the same subjects over a period of time, often used to study development, behavioral, and social changes.
Midlife
A period in an adult's life, often between the ages of 40 and 65, characterized by personal, social, and career transitions.
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