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RuneScape:Grand Exchange Market Watch/Common Trade Index

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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 105.24 Down -0.68

Historical chartEdit

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SummaryEdit

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

  • Start date: 10 December 2007 (at index of 100)
  • Index today: 105.24
  • Change today: Down -0.68
  • Number of items: 27 (last adjusted on 12 February 2012)
  • Index divisor: 23.9535 (last adjusted on 12 February 2012)

List of itemsEdit

This index comprises the following items:

Icon Item Price Direction Low Alch High Alch Limit Members Details Last updated
Abyssal whipAbyssal whip68,753
Down
48,00072,00010P2P iconview8 hours ago
CannonballCannonball375
Up
2310,000P2P iconview6 hours ago
Clean kwuarmClean kwuarm5,441
Down
213210,000P2P iconview6 hours ago
Clean snapdragonClean snapdragon3,472
Up
233510,000P2P iconview6 hours ago
CoalCoal184
Down
182725,000F2P iconview6 hours ago
CowhideCowhide264
Down
0010,000F2P iconview6 hours ago
Death runeDeath rune172
Down
12418625,000F2P iconview6 hours ago
Dragon bonesDragon bones1,627
Up
0010,000F2P iconview6 hours ago
Dragon bootsDragon boots12,377
Down
8,00012,00010P2P iconview6 hours ago
Dragonfire shieldDragonfire shield1,205,621
Down
800,0001,200,00010P2P iconview5 hours ago
FlaxFlax12
Unchg
2325,000P2P iconview5 hours ago
Gold oreGold ore144
Unchg
609025,000F2P iconview5 hours ago
Green dragonhideGreen dragonhide2,135
Down
81210,000P2P iconview5 hours ago
Limpwurt rootLimpwurt root2,099
Down
2410,000F2P iconview4 hours ago
Magic logsMagic logs661
Up
12819225,000P2P iconview4 hours ago
Nature runeNature rune402
Down
497425,000F2P iconview3 hours ago
Oak plankOak plank508
Up
10015010,000P2P iconview3 hours ago
Pure essencePure essence23
Unchg
1225,000F2P iconview3 hours ago
Raw lobsterRaw lobster102
Unchg
11317020,000F2P iconview3 hours ago
Raw monkfishRaw monkfish809
Up
9213820,000P2P iconview3 hours ago
Red chinchompaRed chinchompa2,276
Down
649620,000P2P iconview2 hours ago
Rune armour set (lg)Rune armour set (lg)129,359
Down
Cannot be alchemised100F2P iconview2 hours ago
SharkShark931
Down
12018010,000P2P iconview2 hours ago
Snape grassSnape grass21
Up
4610,000P2P iconview2 hours ago
Soft claySoft clay349
Up
0110,000F2P iconview2 hours ago
Steel barSteel bar710
Up
406010,000F2P iconview2 hours ago
Yew logsYew logs207
Down
649625,000F2P iconview51 minutes ago


AdjustmentsEdit

10 January 2008
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
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}

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