Bilateral Graph

This graph was taken from http://seekingalpha.com/article/241440-will-october-s-improved-trade-deficit-continue

This is a good example of a bilateral graph.  A bilateral graph is a plot that represents two different variables.  There are many different graphs that can represent two variables such as bar, line, or needle.  In this case the graph shows the US trade deficit with the world with the two variables being the month of the year and billions of dollars.