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

However, market declines and increases 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 rise back to it. The opposite occurs during a rise when they sell to take profits.