RuneScape:Grand Exchange Market Watch/Common Trade Index

The Common Trade Index is an average of commonly used items traded at the Grand Exchange, with the starting date of this average on 10 December 2007, at an index of 100. The general health of the RuneScape economy is reflected in this index.

Items may be removed or added to this index over time, but the index will remain "neutral" when that happens, following the method that the Wall Street Journal uses when the Dow Jones Industrial Average (DJIA) is adjusted (see the FAQ for more information).

As of today, this index is 158.11  +0.43

Historical chart

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Summary

Any suggested changes to this index should be added to the talk page.

• Start date: 10 December 2007 (at index of 100)
• Index today: 158.11
• Change today:  +0.43
• Number of items: 27 (last adjusted on 12 February 2012)
• Index divisor: 23.9535 (last adjusted on 12 February 2012)

List of items

This index comprises the following items:

Adjustments

Icon	Item	Price	Direction	Low Alch	High Alch	Limit	Members	Details	Last updated
	Death rune	232		124	186	25,000		view	5 years ago
	Nature rune	405		49	74	25,000		view	5 years ago
	Shark	1,933		120	180	10,000		view	5 years ago
	Red chinchompa	751		64	96	20,000		view	5 years ago
	Raw lobster	353		113	170	20,000		view	5 years ago
	Raw monkfish	1,007		92	138	20,000		view	5 years ago
	Magic logs	380		128	192	25,000		view	5 years ago
	Yew logs	167		64	96	25,000		view	5 years ago
	Gold ore	587		60	90	25,000		view	5 years ago
	Cowhide	547		0	0	10,000		view	5 years ago
	Flax	96		2	3	25,000		view	5 years ago
	Green dragonhide	1,698		8	12	10,000		view	5 years ago
	Coal	112		18	27	25,000		view	5 years ago
	Pure essence	30		1	2	25,000		view	5 years ago
	Cannonball	380		2	3	10,000		view	5 years ago
	Steel bar	959		40	60	10,000		view	5 years ago
	Dragon bones	2,136		0	0	10,000		view	5 years ago
	Soft clay	419		0	1	10,000		view	5 years ago
	Abyssal whip	71,940		48,000	72,000	10		view	5 years ago
	Limpwurt root	5,190		2	4	10,000		view	5 years ago
	Snape grass	134		4	6	10,000		view	5 years ago
	Oak plank	556		100	150	10,000		view	5 years ago
	Clean kwuarm	11,981		21	32	10,000		view	5 years ago
	Clean snapdragon	1,979		23	35	10,000		view	5 years ago
	Dragon boots	11,603		8,000	12,000	10		view	5 years ago
	Dragonfire shield	1,200,875		800,000	1,200,000	10		view	5 years ago
	Rune armour set (lg)	54,668		Cannot be alchemised		100		view	5 years ago

10 January 2008

Adjusted index: Common Trade Index Adjustment date: 10 January 2008 Affected templates: Template:GE Common Trade Index and Template:GE Common Trade Index/Diff Added item(s): 8 — Mithril ore, Raw swordfish, Raw monkfish, Snape grass, Clean ranarr, Clean kwuarm, Clean snapdragon, Vial of water Removed item(s): None Items before adjustment: 15 Items after adjustment: 23 Divisor before adjustment: 14.464460143296 Divisor after adjustment: 21.791759207424 Item Base date Base price Price on adjustment date Comments Coal ca. December 2007 159 Unknown Unchanged Steel bar 540 Gold ore 528 Nature rune 271 Death rune 299 Pure essence 80 Yew logs 411 Magic logs 1,222 Cowhide 109 Flax 70 Soft clay 207 Limpwurt root 646 Law rune 303 Big bones 419 Raw lobster 237 Mithril ore – – 315 Added item Raw swordfish 237 Raw monkfish 350 Snape grass 428 Clean ranarr 5,959 Clean kwuarm 3,030 Clean snapdragon 6,885 Vial of water 98

12 February 2012

Adjusted index: Common Trade Index Adjustment date: 12 February 2012 Affected templates: Template:GE Common Trade Index and Template:GE Common Trade Index/Diff Added item(s): 10 — Abyssal whip, Dragon boots, Rune armour set (lg), Red chinchompa, Oak plank, Shark, Green dragonhide, Dragon bones, Cannonball, Dragonfire shield Removed item(s): 6 — Mithril ore, Law rune, Big bones, Raw swordfish, Vial of water, Clean ranarr Items before adjustment: 23 Items after adjustment: 27 Divisor before adjustment: 21.791759207424 Divisor after adjustment: 23.9535 Item Base date Base price Price on adjustment date Comments Coal ca. December 2007 159 320 Unchanged Steel bar 540 1,335 Gold ore 528 304 Nature rune 271 226 Death rune 299 452 Pure essence 80 125 Yew logs 411 522 Magic logs 1,222 1,592 Cowhide 109 513 Flax 70 72 Soft clay 207 541 Limpwurt root 646 2,060 Raw lobster 237 285 Raw monkfish 10 January 2008 350 601 Snape grass 428 314 Clean snapdragon 6,885 9,866 Clean kwuarm 3,030 1,828 Law rune ca. December 2007 303 363 Removed item Big bones 419 621 Raw swordfish 10 January 2008 325 492 Mithril ore 315 349 Vial of water 98 36 Clean ranarr 5,959 4,958 Abyssal whip – – 420,951 Added item Dragon boots 103,701 Rune armour set (lg) 136,531 Red chinchompa 1,592 Oak plank 639 Shark 1,715 Green dragonhide 2,196 Dragon bones 3,962 Cannonball 407 Dragonfire shield 7,946,801 Calculations From the old divisor obtained from the templates: ${div}_{\text{old}} = 21.791759207424$ We need to calculate a new divisor: ${div}_{\text{new}} = {div}_{\text{old}} \times \frac{\sum \left ( \frac{p}{q} \right )_{\text{new}}}{\sum \left ( \frac{p}{q} \right )_{\text{old}}}$ To calculate the new divisor, we need to find: $\begin{align} \sum \left ( \frac{p}{q} \right )_{\text{old}} & = \text{sum of ratios prior to change} \\ & = \left (\frac{320}{159} + \frac{1,335}{540} + \dots + \frac{1,828}{3,030} \right ) + \left (\frac{363}{303} + \frac{621}{419} + \dots + \frac{4,958}{5,959} \right ) \\ & = 35.26980062 \text{ (up to 8 d.p.)} \end{align}$ And also: $\begin{align} \sum \left ( \frac{p}{q} \right )_{\text{new}} & = \text{sum of ratios prior to change} - \text{sum of removed ratios} + \text{sum of added ratios} \\ & = \sum \left ( \frac{p}{q} \right )_{\text{old}} - \text{sum of removed ratios} + \text{number of added items} \\ & = 35.26980062 - \left ( \frac{363}{303} + \frac{621}{419} + \dots + \frac{4,958}{5,959} \right ) + 10 \\ & = 38.76853218 \text{ (up to 8 d.p.)} \end{align}$ Thus, the new divisor is: $\begin{align} {div}_{\text{new}} & = {div}_{\text{old}} \times \frac{\sum \left ( \frac{p}{q} \right )_{\text{new}}}{\sum \left ( \frac{p}{q} \right )_{\text{old}}} \\ & = 21.791759207424 \times \frac{38.76853218}{35.26980062} \\ & = 23.9535 \text{ (4 d.p.)} \end{align}$