"Fun With the Y Axis"
But look at the Y axes. They don’t match up! This is almost a chart in which the same vertical distance that denotes a $2 billion increase in veterinary expenditures represents a $500 billion increase in human health care expenditures. But not quite. Note that the distance between $2,000 billion and $2,500 billion on the right axis is clearly larger than the distance between $10 billion and $12 billion on the left.
I’m not sure what difference cleaning the charts up would make, but it would certainly make them a lot easier to interpret. One would also want to do some kind of normalizing by population size. Has the number of pets grown relative to the number of people? Shrunk? We know that the demographics of the human population has been aging, but probably not the pet population.