In a 32-bit program an address is a 32-bit value. In a 64-bit program an address is a 64-bit value (although only the low 48 bits are used). In a linear address space, the possible address space is 4GB. One note is that many hardware items are memory mapped to addresses.
However, this will not totally solve the Fedâs problem. Even when it was paying the banks 0.25% interest on reserves, the effective federal funds rate (the rate at which reserves at the Fed were actually being traded) was below 0.25%. This is why the Fed adopted a range for the federal funds rate of 0-0.25%.
Those loans are called fed funds. Banks use these funds to meet the federal reserve requirement each night. If they don't have enough reserves, they will borrow the Fed funds needed to do so from each other. Since the banks set the rate, the Fed is actually setting a target for this important interest rate. By law, the banks can actually set any rate they want. However, this is rarely a problem. They normally meet the Fed's target because the Fed gives them several strong incentives to do so.