Comments by "JP 72" (@739jep) on "Ben Felix" channel.

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  33.  @gmk22799898  it’s a little tricky to explain , I’ll try my best. You seem to understand the difference between the two so I guess you’re wondering why value and size are considered systematic because firms have different price to book values and different sizes - whereas with market risk all companies are exposed to the same inflation rate for example (more on that later) ? I think I understand the confusion. There’s maybe two ways to approach it. Firstly I think it might be helpful if we suspend the thought that an entire market (as in the whole stock market) needs to be exposed to the risk in question for it to be systematic. With size and value for example I think it might helpful to think of small cap stocks and value stocks as being their own market. These markets as a whole are riskier than their counterparts (large cap / growth ) in the same way ‘the market’ is riskier than US treasury bills. Now remembering that if we consider small cap and value stocks to be their own market - then If you were to only buy small caps / only buy value stocks , it doenst matter how many small cap value stocks you buy , you would not be able to diversify away the risks specific to those markets. Keeping this in mind you could also look at it mathematically. Just like with the market premium (rm- rf) factors can be expressed this way as well (SMB and HML). This creates constants for which portfolios and/or individual stocks can have their sensitivity to these variables measured against. This might be useful to understand the concept. Take (rm-rf) for example - all companies are exposed to inflation risk for example yet all companies in reality face different rates of inflation - but we’re still able to express each companies exposure to (rm-rf) the same can be done for value stocks even if they all have different price to book values. I hope that helps , it’s kind of hard to put into words - I hope I wasn’t completely out to lunch although that’s possible 😂 let me know if you have any follow ups or if you noticed something I got wrong
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