Economic and Financial Crime and its Impact on the Economic Security of Ukraine

National economy criminalization and shadow economic relations reproduction has a significant impact on the whole system of national economy at every stage of the historical development, and in particular on the economic security of the state. Shadow economic relations become an obstacle to effective structural reforms in the state. They prevent the state coping with the economic crisis, making the national economy trade and speculative raw material appendage of the global economy. Prerequisites for the development and growth of the shadow economy exist in the system itself. This means that the development and growth of the shadow economy depend on the way of solving the system's contradictions, which under certain conditions can become destructive. Shadow economy is enormous in scale. However, it is not easy to accurately measure it. Shadow economy arises from the desire to avoid measurement, and a number of scientists use indirect methods to give it a relative measure.