Answer :
Final answer:
Selling a house, utilizing a broker, increasing Social Security payments contribute to GDP, but the rise in stock prices does not.
Explanation:
a. An individual sells her house on her own: Increase in GDP because it counts as a final sale of a good. b. An individual sells his house through a broker: Also increases GDP due to the service provided by the broker. c. Government increases Social Security payments: This would increase GDP as it involves government spending. d. Stock prices rise by 20 percent: Increase in the value of assets doesn't directly impact GDP.
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