If you remove any 4 lines from either of your graphs, the scale doesn't matter.
There is no logarithmic relation between any number of series in the linked article because there is only one series in any figure. As such, a linear scale works just fine.
Hu? If you remove 4 lines from the graph the graph is blank.
I'm not trying to link number series in the original article, I'm trying to decide if the dollar volume is indeed flat like he says, but I can't tell by looking at the graph.
There is no logarithmic relation between any number of series in the linked article because there is only one series in any figure. As such, a linear scale works just fine.