The latest edition of Time includes a back cover ad from Dyson with a graph of their vacuum’s suction:

From the graph and the numbers below, it is pretty clear that Dyson has more suction power than the two other pictured vacuums: 160 air watts compared to 68 and 43 air watts. Fair enough, particularly for those who need the most air watts. But, I also wonder if this graph doesn’t represent a common problem with infographics: it is confusing a linear relationship, 160 air watts is more than twice as much as the competing vacuums, with volume. Not only does the Dyson have the most suction power, it is clearly the biggest vacuum in this graph. While I don’t think Dyson wants to sell their vacuum as the largest (in fact, they often pitch its manueverability), it isn’t necessarily bad to show that your product visually dominates the competition.