Neutrophils are the most common type of white blood cell, comprising about 50-70% of all white blood cells. They are phagocytic, meaning that they can ingest other cells, though they do not survive the act. Neutrophils are the first immune cells to arrive at a site of infection, through a process known as chemotaxis.
One of the basic theories stipulates that increasing interest rates raise consumers' and manufacturers' costs, which, in turn, reduces the amount of time and money people spend driving. Less people on the road translates to less demand for oil, which can cause oil prices to drop.
Instead, it sets a federal funds target rate, which the Fed tries to achieve through open market operations -- buying and selling bonds on the open market to change the money supply. Other Rising Rates Stories: Fed Raises Interest Rates for First Time in Nearly 10 Years. How to Play the Fed's Interest Rate Hike in 2016.