Quote from Random.Capital:
The closest the US has come to "hyperinflation" was in the late 70s, early 80s. Attached is a chart showing just how disasterous this was for equity markets.
http://dshort.com/charts/dow.html?dow-since-1900-real-notes
I'm sorry...but that chart is pretty useless IMO because it doesn't account for dividends. The DOW could easily go sideways or down over many years and still have investors growing their money or staying flat even as the DOW is down considerably. This is especially true when counting in decades and not individual years of a bear market.