Her dissertation, Three Essays in Microeconomic Theory, formed the basis for her foundational work in research on two-part tariffs and asymmetrical information, and insurance contracts.
[2] Hayes produced foundational research on two-part tariffs, the economics of information asymmetry, insurance contracts,[3] and public regulation.
[10] In 1994, David Cass was instrumental in establishing the Beth Hayes Prize for Graduate Research Accomplishment at the University of Pennsylvania.
The prize was created in honor and memory of Dr. Hayes, one of his former graduate students whom he describes in his essay "On Women."
Following his death, the University renamed the award as The Beth Hayes/David Cass Prize for Graduate Research Accomplishment in Economics.