Making money in the market is an unnatural act. We humans are predators and hunters evolved to track game on the horizon of an African savanna. Modern humans are maybe 5 million years old, but civilization has been around for only 10,000 years. Our brains have not had time to make the adjustment. In the market, this means that if a stock has gone up, you believe it will continue. This is why market tops and bottoms see volume spikes. To make money, you have to go against these innate instincts. Some people are born with this ability, while others can only learn it through decades of training.