I liked the cross curricular offerings in your STAIR...Your inclusion of
Graphing concepts to show the changes in Supply and Demand were a way to incorporate UDL principles visually depicting concepts presented logically earlier. I think the scaffolding concept works well with your STAIR because the higher level students could review these slides and take the quizzes and walk away empowered about some key economic concepts of changes in quantity supplied and quantity demanded. The vocabulary in your slides was also appropriate to the age group, and the vocabulary challenges them...example, A plague decimates the cattle population. A blight on coffee plants....so I think at many levels you are challenging students. You also employ UDL concepts to make the information relevant by examples of the iphone 5, etc.
I know economics, supply and demand concepts, and the monetary implications. I saw you used a number of Icons, $ in gold, dollar bills as backdrops, which at times seemed all I could concentrate on vs. the quizzes, so is there a way to include the symbols but tone them down?