Модель оценки надежности банка
In the paper some prominent features of a modern financial system are studied using the model of leverage dynamics. Asset securitization is considered as a major factor increasing aggregate debt and hence systems uncertainty and instability. A simple macrofinancial model includes a logistic equation of leverage dynamics that reveals origins of a financial bubble, thus corresponding closely to the Minsky financial instability hypothesis. Using ROA, ROE, and the interest rate as parameters, the model provides wide spectrum of leverage and default probability trajectories for the short and long run.
Using data on foreign borrowing, I identify Russian banks that were affected by the sudden stop of external financing caused by the Lehman Brothers’ collapse. Applying the difference-in-difference method, I compare these «affected» banks to «unaffected» ones and find that the Russian Central Bank’s (CBR) anti-crisis financial assistance primarily went to the former group. Tracing the impact of the CBR’s liquidity infusions on banks’ portfolio allocation decisions, I find that banks used CBR funds not only to pay out foreign debt, but also to accumulate cash deposits in non-resident banks. I also find that affected banks increased their holdings of market securities significantly more than unaffected ones, which suggests that the CBR’s bailout policies impacted their risk-taking strategies. While there was no significant difference in corporate lending growth between the two groups after the sudden stop, lending to borrowers with weaker banking relationships (individuals and entrepreneurs) decreased more among affected banks.