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

However, market declines and rises often occur due to the behavior 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 happens during a rise, where they sell to realize profits.