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.
Experts from the Global Network for Advanced Management weigh in on how fluctuating oil prices affect the economy in their home countries. During the past decade, the price of oil has traveled from $60 per barrel to a peak of $146 in 2009 and subsequently descended again to below $50 in 2015. While oil is sold in a global market, the effect of rising or falling prices can be very different for importing and exporting countries.