Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

How do you quantify investment risk?
For a retail investor who isn't a Physics or Math major, the "Beta" of the stock is probably the best way to quantify risk.  Examples: A Beta of 1 means that a stock moves in line with the market. Over 1 means that you would expect the stock to move up or down faster than the market as a whole. Under 1 means that you would expect the stock to move slower than the market as a whole.