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.
The demand curve is relatively flat and the drop in supply (from S to S') causes only a small increase in price (from P 0 to P 1). However, if the demand curve is less elastic or more vertical (as in the graph on the right), the same cut in supply causes a much larger increase in price.t traces the price of a barrel of oil over the last 50 years in terms of 2012 prices. In this case, the price increases of the 1970's look remarkably similar to those of the 2000's. And wild price fluctuations, even when adjusted for inflation, have been the rule.