unitedstates The chart to the right shows a graph with a declining set of measurements. The graph is of some data set from the US. Its shape reflects a lot of graphs pertaining to the US with its obvious downtrend.

Can anyone guess what this particular downtrend represents? Here are a couple of hints:

  1. It is an index of something or somethings.
  2. This one graph goes a long way to explaining many of our economic problems.

In a few days I will supply the answer to what this graph represents.