It was pointed out that the first price was higher originally. The funny thing is that in that case the price of four would be nice to know. With the given information it would be economically more efficient to buy two times two if you wanted four vs one times three and then an additional one.
There's no positive or negative, just share (width). It is done creatively but still accurately, it looks like the most dominant segment takes the center allowing you to easily spot which was the most popular at what year.
top gun! https://yewtu.be/watch?v=Vg5h85k42jU