And before you say "were you gone?", a combination of a family funeral, a round of the flu, a secondary respiratory infection and end of term for one of my on-line courses have made things a bit busy here. I'm still recovering but I'm feeling better. Nevertheless, I thought I would start out slow...
Here are a couple cartoons (HT to Economics and Ethics) to use in your class. The first is a classic example of how constantly chasing efficiency can create its own trade-offs.
And this link will take to you an illustration from The Washington Post that could prove very useful when explaining the risk/return concept.
I'll try to get back in the swing of things during this week.