This apps intention is obvious, and its quite good. However I selected the same answer probably 6 times before I finally realized either the system, or myself, wasnt doing something right. So I gave up. If there was a way to tell the user if they were wrong immediately that might be better than just giving them free reign to play until they figure out that theyre wrong. I do love that theres a section that can show you exactly what each questions answer is in a very brief lesson.
Cweezec about ConceptIQ : Micro-economics