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%.
The fed funds rate is the interest rate for short-term loans from the Federal Reserve to the banks. As of May 2015, the Federal Reserve had been keeping the target rate at 0.25 percent since December 2008. When the fed funds rate rises, the prime rate rises with it. The prime rate can change from one week to the next, or it can remain the same for years. It all depends on the target federal funds rate set by the Federal Reserve, which in turn varies with the growth, or lack of growth, in the national economy.