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.
Oil price falls below $50 as U.S. supplies hit record. Image source: Getty Images. After suffering more than two years of declining or low oil and gas prices, the financial statements of energy companies have been absolutely ravaged. Cash flows have dried up, balance sheets have been ballooning up with debt, and more than a few companies have filed for Chapter 11 bankruptcy.