This lesson includes two lists of the medaling companies from the 2010 Winter Olympics, and two charts of GDP's.
I did this lesson first in a high school Economics class, but it can definitely be adapted to a wider age range than just high school.
After the earthquake in Haiti, my Economics class had gone from a discussion of Haiti having the lowest GDP per capita in the Western Hemisphere to what countries had the highest/lowest in the world. They predicted (brainstormed) which countries would be on each list - then we found a list and compared their predictions. We also located the countries on our world map.
I did a follow up lesson with their interest in the Olympics. First, we discussed/brainstormed what factors might influence a country's chances of medaling in the Olympics. They came up with factors such as population, weather, economy (personal GDP or overall GDP), and history/government.
Then I asked them to each predict what they thought would have had the most impact. (It would have been interesting to have started this discussion just BEFORE the Olympics, but maybe next time!)