What do we call the component of a stock's risk that can be eliminated simply by having a really large portfolio of stocks? (There were several different names for this mentioned in lecture.) What do we call the component of a stock's risk that can't be eliminated, no matter how diversified your portfolio is? (Again, several different names were mentioned.) Can you think of some possible real-world events (either affecting the economy as a whole, or just affecting one firm specifically) that would contribute to each type of risk