Fuzzy Choice Functions A Revealed Preference Approach

From the reviews:

"This book, based on the author’s PhD thesis, is an excellent extension of the revealed preference theory to the fuzzy case where preference and choice are fuzzy. … is basically a mathematic text, it is highly recommended to choice theorists and to specialists in fuzzy mathematics. Choice theorists will discover the interest of using fuzziness to deal with a more realist universe and mathematicians working on fuzziness will see how fuzzy mathematics can be used in a highly theoretical part of social science." (Maurice Salles, Zentralblatt MATH, Vol. 1130 (8), 2008)