The Grand Exchange Market Watch is a project set up to monitor and record the prices and other
information on items on the Grand Exchange.
What is an index?
An index is a method of measuring the value of a section of the market. It is computed from the
prices of selected items. In a price-weighted index such as the Dow Jones
Industrial Average (DJIA),
the price of each component item is the only consideration when determining the value of the index.
Items may be removed or added to indices over time, but the index will remain "neutral" when that
happens, following the method that the Wall Street Journal uses when the DJIA is adjusted.
The Market Index (MI) is one of the indices calculated
from the Grand Exchange Market Watch. The MI shows the health of the Old School RuneScape economy in
general. The MI is worked out using a list of items which are traded very often. There are also
other indices such as the Rune, Log, Food, Metal, Herb and Indices, all of which show the health of
that aspect of the Old School RuneScape economy and work in the same way as the Market Index.