The international financial crisis in the American economy in 2008 brought again to the fore an economic discussion on the origin of crises. Previously, only the 1929 accident had such magnitude, putting in discussion the economic policies adopted until then, raising the economic debate between several economic schools of thought. The effects of the crisis were notorious about the financial markets, but also hit hard the real economy, especially the productive sector, such as industry and services. Indeed, the consequences on employment, income and on the level of trade were not only felt by the American economy, but also in other countries. Starting from this context, this article aims to describe the propelling elements and the forms of theoretical manifestation of the crises under a marxist perspective, seeking to understand the origins of this phenomenon from the marxist stream, as well as discourse about the 2008 crisis and its developments on the American economy. Therefore, it makes use of economic indicators on the evolution of prices and sale of real estate in the United States, growth rate of gross domestic product and employment and income between 2000 and 2010. The methodology also includes the arguments on the capital bearer of interest and fictitious capital in addition to the role of the rate of profit, exposed in the Marxist conception of the origin of financial crises. As a result, it can be seen that the fictitious capital dominates economic and political relations so that the crisis has its origin on capital and not in the productive sphere.