The basic backbone of this paper concerns the philosophical and ideological principles, ideas and values of one of the greatest thinkers, but also a critic of modern times and society, the famous German scientist Karl Marx. Other world theorists, professors and scientists still pass on their legacy through numerous works, and they have also become an indispensable part of the world literature on economics, especially political economy, as well as criticism of society. Thus, the fundamental ideas of Marxism and Marx's theory are transmitted through the work. In addition, the theoretical framework of economic theories is given. With the development of modern economies and the ways of doing business and trade, it is becoming increasingly clear that the ideas that Marx tried to convey are still applicable in today's world. Therefore, the paper will give a brief overview of today's modern economy with the principles of Marxist ideology. More precisely, it will be seen which problems in the modern economy are present and which of these problems this economist has pointed out. Towards the end of the paper, an interpretation of modern economic crises according to Marxism will be made and we will see that most crises arise on the same principle as in the last century, more precisely from the same or similar causes cited by Marx. At the end of everything presented, a meaningful conclusion will be given and the stated hypotheses of the paper will be confirmed or refuted.