Bilateral graphs are used to graph data with two related variables within the same time period. The two lines are usually trending inversely (one negatively and one positively) and intersect and produce two overlapping areas. This graph looks at U.S. real private consumption relative to global real GDP in relation to the U.S. trade balance. In February 2005, while the real private consumption relative to global real GDP increased, the trade balance decreased. The overlapping area to the left of the intersection shows net loss while the area to the right shows net gain.
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