Market tops and bottoms are always a popular topic of conversation. There are a number of theories about how to forecast key turning points in advance, but, in reality, those theories rarely work.

While it does seem like an exercise in futility to forecast the day and price of tops and bottoms, there is valuable information to learn from studying the general nature of market turning points. This knowledge will help us understand what to look for and how to react to the market as it develops rather than provide a false sense of comfort about what we should see.

In the stock market, we tend to see tops build slowly and bottoms appear unexpectedly. This can be seen in the chart below, which shows the 2007 market top on the left and the March 2009 bottom on the right.