ics ▁and ▁cogn itive ▁econom ics . ▁ ▁He ▁is ▁especially ▁known ▁for ▁his ▁important ▁work ▁in ▁the ▁areas ▁of ▁pre ca ution ary ▁saving ▁and ▁survey ▁measurement ▁of ▁preference ▁parameters . ▁Kim ball ▁( 1 9 9 0 ) ▁first ▁defined ▁the ▁pr ud ence ▁index ▁to ▁measure ▁the ▁intensity ▁of ▁the ▁pre ca ution ary ▁mot ive . ▁He ▁was ▁also ▁awarded ▁the ▁Samuel son ▁Prize ▁Cert ificate ▁of ▁Ex cell ence ▁for ▁his ▁work ▁in ▁survey ▁measurement ▁of ▁preference ▁parameters . ▁He ▁also ▁has ▁published ▁well ▁c ited ▁articles ▁often ▁in ▁the ▁fields ▁of ▁labor ▁market ▁dynamics , ▁and ▁the ▁econom ics ▁of ▁uncertainty . ▁ ▁Inter ests ▁ ▁In ▁ 2 0 1 6 ▁Kim ball ▁began ▁to ▁give ▁sust ained ▁attention ▁to ▁nut r ition ▁and ▁fast ing , ▁ar ising ▁from ▁a ▁personal ▁quest ▁to ▁manage ▁his ▁own ▁weight ▁and ▁health . ▁He ▁has ▁collected ▁significant ▁resources ▁on ▁these ▁topics , ▁much ▁of ▁which ▁he ▁has ▁made ▁available ▁online . ▁He ▁has ▁declared ▁Canadian ▁ne ph ro log ist ▁Jason ▁F ung ' s ▁book ▁The ▁Ob es ity ▁Code ▁( 2 0 1 6 ) ▁ ▁to ▁be ▁the ▁fifth ▁and ▁latest ▁of ▁the ▁five ▁books ▁that ▁have ▁changed ▁his ▁life . ▁ ▁References ▁ ▁External ▁links ▁▁ ▁Conf essions ▁of ▁a ▁Supp ly - Side ▁Liberal ▁blog ▁Profile ▁and ▁Pap ers ▁at ▁Research ▁Pap ers ▁in ▁Econom ics / Re PE c ▁Kim ball ' s ▁U ▁of ▁Michigan ▁website ▁Conf essions ▁of ▁a ▁Supp