Profit strategy of Greek banks: cross-subsidization and diversification versus complementarity

This study analyses the profit strategy employed by banks in Greece using dynamic panel data techniques and a data set which includes proprietary supervisory data covering the whole Greek commercial banking system from 2004 to 2011. We provide evidence that banks use interest- and non-interest income (non-II) as substitutes rather than complements, with non-II representing an indirect competition instrument by the more efficient banks used in place of direct competition with their peers through prices on loans and deposits. This behaviour is explained by further decomposing the non-II into the relatively stable fees component and the volatile trading income. Moreover, we provide evidence that the net-interest income is primarily affected by the banks’ market power and their operating costs, while more efficient banks exploit their core deposit base to lever their non-II. Finally, macroeconomic developments affect both income components, which are found to be procyclical with respect to economic activity. In particular, the two income components are affected differently from inflation implying that non-II provides a natural hedge against adverse effects from deflation on interest income.