Make a star out of construction paper.(2 points)
The Catch was that not all the groups had the same supplies. I distributed only two half sheets of yellow paper, two rolls of tape, and only three pairs of scissors to the four groups. The groups could trade but they could not use any other materials in the room. Groups were also subject to a "natural disaster" and I could take supplies at any time.
It worked perfectly!! They totally understood the concept of scarcity when it was all done and they even related it to some real life situations! All in all, it was a pretty successful day!