This bubble chart is a unique way of displaying up to 4 dimensions or variables on what is typically used for 2 dimensional charts.
Typical 2 dimensional charts simply plot data points on an X and Y graph. Bubble charts add a 3rd dimension by plotting the size of that dot in the form of a bubble. The bigger the bubble, the larger that dimension size. In this case, the size of the bubble represents price - so the larger the bubble the higher the price.
This colored bubble chart adds a 4th dimension with color. Notice this 4th dimension does not have numerical values. Instead, it displays a qualitative attribute of the private jets to the graph.
Bubble charts may be new to you, but they're actually quite simple - and fun.
source: GMAT Pill - Bubble Chart
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