this post was submitted on 16 Jun 2024
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The Y axis is throwing me off a bit. If the X axis already shows the amount of protein per mass, why would you also couple the Y axis to the amount of protein? So all the products low on the X axis automatically increase along the Y axis. For example, the vegetables are probably that costly in this graph because they have a low protein content, not because they are necessarily that expensive.
I assume this chart is intended for people making an effort to eat as much protein as possible for as cheap as possible, I.e. bodybuilders, powerlifters, and the like. In that case you would want to avoid vegetables because of their low protein regardless of how much they actually cost, so the cost per gram of protein is actually more useful.
In fairness I may be reading too much into it; nothing about the chart actually specifies who it's for.
Fair point, I guess this would be a good reason to plot it like this. Maybe the author of the graph should have labeled it accordingly to avoid confusion though...
There are some applications that require normalizing an axis by the measured variable, usually just to make something linear. Not sure what the reason here would be.