[list][*]Geogebra: an awesome tool![/*][*] simplistic economic models[br][/*][*] Build it[/*][*] Play with it[/*][*] illustrations for assignments: DIY[/*][/list][br][list][*]Are there any gaps?[/*][*] Give us infinite graph areas, please![/*][*] We use too many variables[/*][*] Students need to strenghten their mathematical skills[/*][*] Multivariable function intuition[br][/*][/list]