I was thinking of implementing a column chart with two bars for each item displaying the current month and the previous month values.

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    I came across this only yesterday: Choosing a good chart Sep 16 '14 at 9:03
  • @RogerAttrill - I think you should post that in answer form. Run through it and cite the answer it gives for the OP's situation. Certainly a worthwhile contribution- IMO. Apr 10 '16 at 17:35

Candle Stick bar charts with x-axis being time & y-axis being dollar would be a suitable graph.

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Stock prices do it with high low bar. It is pretty much the standard practice from even before computers.

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    Can you link to an image to make it clearer what you mean? Also, can you cite any evidence to support your assertion that it is a "standard practice"? Sep 18 '14 at 3:03
  • @3nafish Really you have never seen a stock high low for the day chart?
    – paparazzo
    Sep 18 '14 at 10:15
  • @Paparazzi - they aren't confused about what you are referring to. They are pointing out how to make you answer self contained, and better as a result. Also, for clarification on your assertion that such a graph is a "standard" for displaying such data - which is a reasonable request. Apr 10 '16 at 17:37

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