The Federal Reserve has been boosting liquidity since mid-September when a spike in the overnight lending rate shocked the financial system. The central bank is using market repurchase agreements — or repos — and Treasury bill purchases to inject capital into money markets. But many find the actions are ineffective in normalizing the key rate. Here's why the Fed's actions may not solve lending pressures, and how they may point to additional problems to come. Visit the Business Insider homepage for more stories. The Federal Reserve has been injecting capital into the financial system for weeks to calm money markets.