In the last lesson I mentioned how my father would always mention to me how “the market was up”. Knowing now that there thousands of companies traded in the equity markets you may wonder what my father meant by “the market”. Was it that on that day he saw more green, upward arrows on MSNBC than red, downward arrows? Was it that on that particular day his stocks were doing well and he wasn’t paying attention to the other stocks? He was most likely looking at stock market indices such as the DJIA, S&P 500, or Russell 2000. These indices (or indexes) are commonly used to describe the health of the overall stock market and as a result are closely monitored day in and day out.