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Martinez is interested in how thinking changes in adolescence and early adulthood. She identifies two hundred 18-year-olds and has them respond to a written set of questions. She then waits four years, contacts them all again, and has them respond to a similar set of questions. Finally, she waits another four years, contacts the people again (who are now 26 years old) , and asks them one last time to respond to her questions. The study Dr. Martinez has conducted is best considered an example of:
Aggregate Demand
The total demand for all goods and services within a particular market over a specific time period.
Aggregate Supply
The total supply of goods and services that firms in an economy plan on selling during a specific time period at prevailing price levels.
Technology Advances
Progress in technology that improves efficiency, creates new products, or enhances the quality of existing products.
Aggregate Supply
The overall volume of goods and services that enterprises in an economy expect to sell within a specific time interval.
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