Summary

In work it is analysed the modern problems of the world economic crises by standpoint of the theories of business cycles.

The main reason for present global crisis is a disproportion of world economy, which was masked by growth of national debts in a long time, first of all in the USA and Japan. This  disproportion are caused by a huge gap between potential possibilities of production in the USA, Japan and Europe, saturation of their domestic market (overproduction) and absence of the adequate markets for sale of their production because of unevenness of the world development caused by historical desire of the countries of the West to keep the hegemony by preservation of backwardness and operation of Third World countries, come back to them a boomerang. Probably, the condition in the USA economy would be better better, if Africa, Russia, Latin America and India would have more developed economy. This that J. Stieglitz called «weakness of global demand».

Those politicians who see ideal model of economy with zero public sector, don't understand that such system can be especially unstable. It is necessary to understand accurately that the market in itself isn't panacea and can't coordinate completely the activity, especially in a crisis situation. It is necessary reasonable state regulation and planning.

Keywords: crisis, economic cycle, recession, financial fragility, banking sector, money multiplier, interest rate, credit boom, aggregated demand, liberalism.