Utilize the input text as a context reference, choose the right relationship between 'Esther Duflo' and 'Massachusetts Institute of Technology' from the options.
Options: chairperson, legal form, employer, creator

As a result, note Abhijit Banerjee and Esther Duflo of the Massachusetts Institute of Technology in their book , “Poor Economics”, published in 2004, it takes “that much more skill, willpower and commitment” for the poor to get ahead.
employer