Utilize the input text as a context reference, choose the right relationship between 'Esther Duflo' and 'Massachusetts Institute of Technology' from the options.
Options: employer, location of formation, industry, distributed by

Abhijit Banerjee and Esther Duflo of the Massachusetts Institute of Technology cite the example of poor Indians, who often say it is hard to resist buying sugary tea, a costly treat that brightens up dark days but is not nutritious.
employer