The economic crisis of 2009 proved earlier assumptions that the fast-growing economy was heading for implosion of the economic bubble, because it was driven mainly by growth of domestic consumption, financed by a serious increase of private debt, as well as a negative foreign trade balance. The prices of real estate, which were at some points growing by approximately 5% a month, were long perceived to be too high for the economy, which mainly produces low-value goods and raw materials.