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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 123.78 Down -0.88

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: 123.78
  • Change today: Down -0.88
  • 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 whip70,609
Down
48,00072,00010P2P iconview5 hours ago
CannonballCannonball337
Down
2310,000P2P iconview3 hours ago
Clean kwuarmClean kwuarm6,107
Down
213210,000P2P iconview3 hours ago
Clean snapdragonClean snapdragon3,669
Up
233510,000P2P iconview3 hours ago
CoalCoal159
Down
182725,000F2P iconview3 hours ago
CowhideCowhide378
Down
0010,000F2P iconview3 hours ago
Death runeDeath rune173
Up
12418625,000F2P iconview2 hours ago
Dragon bonesDragon bones1,472
Down
0010,000F2P iconview2 hours ago
Dragon bootsDragon boots11,037
Down
8,00012,00010P2P iconview2 hours ago
Dragonfire shieldDragonfire shield1,218,665
Unchg
800,0001,200,00010P2P iconview2 hours ago
FlaxFlax16
DownDown
2325,000P2P iconview2 hours ago
Gold oreGold ore160
Up
609025,000F2P iconview114 minutes ago
Green dragonhideGreen dragonhide1,889
DownDown
81210,000P2P iconview110 minutes ago
Limpwurt rootLimpwurt root3,314
Down
2410,000F2P iconview56 minutes ago
Magic logsMagic logs543
Down
12819225,000P2P iconview50 minutes ago
Nature runeNature rune382
Down
497425,000F2P iconview21 minutes ago
Oak plankOak plank629
Up
10015010,000P2P iconview17 minutes ago
Pure essencePure essence34
Up
1225,000F2P iconview35 hours ago
Raw lobsterRaw lobster149
Up
11317020,000F2P iconview35 hours ago
Raw monkfishRaw monkfish746
Up
9213820,000P2P iconview35 hours ago
Red chinchompaRed chinchompa2,197
Down
649620,000P2P iconview35 hours ago
Rune armour set (lg)Rune armour set (lg)129,340
Up
Cannot be alchemised100F2P iconview35 hours ago
SharkShark1,303
Up
12018010,000P2P iconview35 hours ago
Snape grassSnape grass21
DownDown
4610,000P2P iconview34 hours ago
Soft claySoft clay686
Down
0110,000F2P iconview34 hours ago
Steel barSteel bar523
Down
406010,000F2P iconview34 hours ago
Yew logsYew logs191
Up
649625,000F2P iconview33 hours 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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