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Price graphs: why not percent change?
Actually, total return is the most important which isn't necessarily just price change as this doesn't account for dividends that may be re-invested.  Thus, the price change isn't necessarily that useful in terms of knowing what you end up with as an ending balance for an investment. Secondly, the price change itself may be deceptively large as if the stock initial price was low, e.g. a few dollars or less adjusting for stock splits as most big companies will split the stock once the price is high enough, then the percentages can be quite large years later. Something else to consider is the percentage change would be based on what as the initial base.  The price at the start of the chart or something else?  Carefully consider what you want the initial starting point to be in determining price shifts here as one could take either end and claim a rationale for using it. Most people want to look at the price to get an idea of what would X shares cost to purchase rather than look at the percentage change from day to day.