The final paper explains in detail the situation as it was before the crisis of 2007/2008, the development, ie the emergence of this global crisis and its impact on the world, as well as a description of the crisis caused by the appearance of the COVID-19 virus. Economic crises represent an undesirable and difficult period in the world economy, in addition to efforts to prevent crises and reduce their effects, they leave big negative consequences. The consequences of the crisis have been dramatic and the economy is always experiencing a major downturn. The trigger for the financial crisis in 2007/2008 was the bursting of the "bubble" of the real estate market in the United States, all due to the crisis of subprime mortgages. The economic measures that will be applied by the world leaders and leaders of the most powerful countries are of historical importance because the frequency and depth of economic crises, and thus the future of the world economy, will depend on their efficiency.