The small business optimism index is compiled from a survey that is conducted each month by the National Federation of Independent Business (NFIB) of its members. The index is a composite of 10 seasonally adjusted components based on the following questions: plans to increase employment, plans to make capital outlays, plans to increase inventories, expect economy to improve, expect real sales higher, current inventory, current job openings, expected credit conditions, now a good time to expand, and earnings trend.

Small businesses are responsible for a majority of new job creation and the NFIB focuses on this sector of the economy. The direction of the health of small businesses can portend changes in the stock market - especially small caps.