Kim C. Border was an American behavioral economist and professor of economics at the California Institute of Technology.
Border received a bachelor's degree in economics from Caltech in 1974. Shortly after completing his Ph.D. in economics at the University of Minnesota in 1979, he returned to Caltech as a faculty member, where he remained for over forty years.
Border specialized in decision theory and auction design. In 1991, he proved a set of inequalities (now known as Border's theorem) that characterize the possible allocations for a single-item auction, a result that now plays a key role in the computational design of auctions. He also contributed several applications of Arrow's impossibility theorem to economic domains.
Border was also known for his teaching in subjects of mathematical economics, and for his extensive in-depth lecture notes.
Border died on November 19, 2020, and is survived by his son.