Today in the morning, when I filled up my car I found surprisedly that the petrol price rose again. The petrol price always is easy to rise but difficult to fall because the oil is monopolized. So it means whenever the oil company need more money they can rise the price without any permission. They can rob our money legally as long as they want. In addition, when they suffered from the huge loss abroad because of their wrong strategy or incompetence, they always tried their best to retrieve the loss by rising price at home, robbing happens. All of us are common people and victims because the rise of petrol price will cause a series of inflation of prices. I have nothing to say but silence.