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.
If the market interest rate goes up, then these borrowers pay more interest. Increases in interest rates mean costs rise, profits fall and share prices are reduced. Conversely, when interest rates fall, many companies report higher profits without changing any other aspect of their business, boosting their share price. In general, stock prices are inversely related to interest rates.