Bilateral Graph

 

http://seekingalpha.com/article/241440-will-octobers-improved-trade-deficit-continue

This is an example of a bilateral graph because the graph provides more than two sets of data.  The U.S. trade deficit with the world is broken down into billions of dollars spent, months of the year, and the overall projections of the years 2009 and 2010.  Using the map you can see the amount of billions of dollars fluctuate over the two year spans.  The graph provides a great visual to compare certain points over time.