Losing count of money bags

I found this chart on a Munich publication called Süddeutsche Zeitung. This appeared during the most recent Greek/Euro crisis.

The bags of money were financial obligations that were coming due from June 2015 to December 2015. There were three creditors, indicated by red, blue and gray.

This graphic answers one question well: individual debt obligations for a given month and given creditor. However, by privileging these details, the chart fails to convey cumulative totals well - readers have to make calculations in their heads.

In the revision, I wanted to convey two key messages: the total amount of debt that was coming due in those seven months, and the relative proportion of debt owed to the three creditors. An area chart brings this out better.

Conversely, it is much harder to figure out individual debt obligations by month and creditor from this version.

This points to the importance of determining your key message(s) before choosing a form.