No, it isn't. People are interested in whether a stock has volatility, and whether it has moved x%. If a $10 stock loses $1 it should show a roughly matching pattern to a $200 stock losing $20. Intersecting at zero will show a very large movement for the $10 stock and a very small movement in the $200 stock, despite the effect being the same to stockholders.

> Intersecting at zero will show a very large movement for the $10 stock and a very small movement in the $200 stock...

How so? Surely both will show a 10% movement?