Most of the time, stock markets seem to be "random". They rise one day and then fall the next, and their condition often changes between different trading sessions on the same day. This can sometimes happen due to positive information that led to the market rising, or negative information that caused it to decline.

However, market declines and rises often occur due to the behaviors of speculators. When the market drops to a certain extent, some traders see it as an opportunity to buy, thus entering the market and bringing some movement and upward momentum back to it. Then the opposite occurs during a rise, with selling to take profits.