4. Watch a video from Esther Duflo, a world renowned development economist at MIT who won the Clark Medal in 2010 and the Nobel Prize in 2019, on randomized controlled trials: http://www.ted.com/talks/esther_duflo_social_experiments_to_fight_poverty. a) Briefly describe the randomized experiment on immunization. What is the research question? What is the research design and what are the treatments? What are the findings to each treatment? Please state the magnitudes of findings by calculating difference-in-difference estimates for each treatment. b) Briefly describe the randomized experiment on bed nets. What are the three research questions? What is the research design and what are the treatments? What are the findings to each research question? Please state the magnitudes of findings by calculating the differences estimate between the free option and $3 option.

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Select 6 online companies you are familiar with and visit their Web sites. How many of them have privacy policies posted on their sites? What are these policies?