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I'm not sure how much you should count my input, but this was my first time to have seen a double-y axis chart and I'm still not sure if I was reading it correc

• Cshelton 11y ago
  Don't worry, that's generally how most people feel, even if you've seen them many times. You have to pause and say, "...wait". I'd argue that the trends you actually see in almost all of them are misguided.
  • boxy310 11y ago
    I'd say the bigger concern is spurious correlation. The two factors may very well be unrelated, or share a common cause (like drowning and ice cream prices -- they're both driven primarily by heat). However, when talking about price and revenue it is legitimate to render them on the same chart, since revenue is a function of price. Steam in particular has proven to be a wonderful platform to demonstrate this phenomenon, as the elasticity of demand for games software is very high, and discounting even modestly generates far more revenue than you lose through the discount. Steam and the publishers benefit even more due to the low marginal cost of delivery, largely accountable to transmission costs and the marginal wear-and-tear on data servers.