Previously we saw that the appearance of stacked area charts changes with how variables are ordered. This is a serious deficiency.
Lets return to the bond market chart.
What is the relative prevalence of each type of debt over time? In the original chart, this information is buried and can be extracted only painstakingly.
The junkart version brings out this insight without much fuss. As a percentage of total bond market debt, US Treasuries has dropped by half over the last two decades, much of it happening in the late 1990s. Meanwhile, mortgage debt more than doubled during the same period, much of it occurring during 1985-1993. The current distribution is also more balanced than in the last 20 years, as can be seen from the narrow spread.
A few design features are worth noting. The vertical axis is given on both sides of the chart. Limited colors are introduced to help readers distinguish the various lines. Light vertical gridlines are provided to allow analysis during each 5-year period. Non-essential tick labels are removed from vertical axes.
In fact, this is again a variant of the Bumps chart. For more, see here, here and here.
Reference: Data from Bondmarkets.com (via Mahalanobis)