I'm outsourcing today's post to reader Joel D., who describes himself as a geographer, professional researcher and son of a graphics designer. He wrote a wonderful entry about the following pie chart:
You know this "big graphic" is in big trouble when the caption tells you only 4 clubs made a profit and yet you'd be hard pressed to locate those 4 clubs from the chart itself!
The other telling sign is using blocks to represent profit/loss. This never works whether the blocks are pie sectors or stacked bars. Line charts are much better.
Joel has much more commentary, and an improved chart here. Enjoy!