This Friday is the day North American bargain hunters love : Black Friday.

When I was a kid, Black Friday sales didn't seem to exist; this holiday shopping weekend is all the rage now. It’s said to be marked by retailers discounting inventory around this time of year to get their earnings out of the “red” and into the “black.” You can check out the history of Black Friday here.

I’m not sure who coined this saying, but it's an interesting one: Stocks are the only thing I can think of that, what they go on sale, nobody wants to buy them. It’s pretty funny, and certainly accurate. If a 60” Smart TV was regularly $1,999, but on Black Friday suddenly dropped by 25% to $1,499, people would be tripping over each other in the parking lot to get the new TV.

On the other hand, if the stock of a leading electronics manufacturer decreased 25% from its high, those who owned it would panic and those who didn’t would be afraid to buy it.

Investing in stocks is as much about gauging human behavior and market sentiment as it is about digging into financial statements. From my point of view as your portfolio manager, I ask that you please don’t think I’m totally nuts should I step in and buy marked-down stocks if some good ones go on sale this Black Friday.