Commerce

This information is reliable as of patch 2.0.201.56.

Caves of Qud has a bartering system where items vary in price based on a multitude of factors. Commerce is the base value that is specified for each item that is then multiplied or divided by a multiplier depending on selling or buying.

Trading Multiplier Formula

$\text{Multiplier}=0.07\times (\text{Ego Modifier}+2\text{(if Snake Oiler)})+0.35$

If the player has Glotrot, Ego modifier and Snake oiler no longer have an effect and returns a flat -3. The equation then becomes

$\text{Multiplier (with Glotrot)}=0.14$

The multiplier cannot be higher than 0.95(achievable with +9 Ego modifier or +7 Ego modifier with Snake Oiler) and the multiplier cannot be lower than .05 (-5 Ego modifier).

When buying an item from a trader, the value of the item in question is divided by this multiplier. When an item is sold by the player, its value is multiplied by the multiplier.

Ego/Trade Modifier	Sell Price	Buy Price	Buy:Sell Ratio
-5 or lower	.05	20	400
-4	.07	14.3	204
-3 (or glotrot)	.14	7.14	51.0
-2	.21	4.76	22.7
-1	.28	3.57	12.8
0	.35	2.86	8.16
+1	.42	2.38	5.67
+2	.49	2.04	4.16
+3	.56	1.79	3.19
+4	.63	1.59	2.52
+5	.70	1.43	2.04
+6	.77	1.30	1.69
+7	.84	1.19	1.42
+8	.91	1.10	1.21
+9 or higher	.95	1.05	1.11

Reputation Effect on Trade Prices

Reputation with the merchant also affects trade prices, acting essentially as a bonus or penalty to the player's ego modifier.

Reputation with merchant	Bonus applied to Ego Modifier for Trade
600 or more	+3 bonus
250 to 599	+1 bonus
-249 to 249	0
-599 to -250	-1 penalty
-600 or less	-3 penalty

Sacred Well Reputation Formula

Main article: Sacred well

How much reputation the Sacred well gives is also dependent on the commerce value of the object.

$\text{Reputation}=\text{Commerce}/10$

Reputation cannot go lower than 1, and an object that has no specified value defaults to 10 reputation.

Book Experience Formula

$\text{Exp}=\text{Floor}(\frac{Commerc{e}^2}{25})$

Modifications and Commerce

Each modification has a Value attribute that is multiplied against the base Commerce value to get the new modified value.

Items by Commerce Value

Item	Value	Weight	Category
Item	Value	Weight	Category
Otherpearl	$33333	0#	Bracelets
Kesil Face	$10000	1#	Masks
Hand-E-Nuke	$10000	1#	Grenades
Shemesh Face	$8000	1#	Masks
circle of light in the chord of Bethsaida	$7500	1#	Floating Nearby
circle of light in the chord of Ehalcodon	$7500	1#	Floating Nearby
circle of light in the chord of Qas	$7500	1#	Floating Nearby
circle of light in the chord of Agolgot	$7500	1#	Floating Nearby
circle of light in the chord of Qon	$7500	1#	Floating Nearby
circle of light in the chord of Rermadon	$7500	1#	Floating Nearby
circle of light in the chord of Shugruith	$7500	1#	Floating Nearby
sail from the Great Machine	$6666	50#	Cloaks
gear from the Great Machine	$6666	50#	Shields
gauge from the Great Machine	$6666	50#	Masks
flange from the Great Machine	$6666	250#	Armor
Earth Face	$6500	1#	Masks
zetachrome lune	$6000	35#	Armor
Levant Face	$5000	1#	Masks
Null Face	$4000	1#	Masks
Olive Face	$4000	1#	Masks
mecha power core	$4000	70#	Items
swarm rack	$3200	300#	Heavy Weapons
timecube	$3000	1#	Trinkets
mental aggregator	$2265	1#	Helmets
psychodyne helmet	$2140	12#	Helmets
transkinetic cuffs	$2100	6#	Bracelets
spaser rifle	$2000	16#	Rifles
phase cannon	$2000	5#	Heavy Weapons
cathedra with ruby tracery	$2000	20#	Cybernetics
Fist of the Ape God	$2000	120#	Cudgels
cathedra with sapphire tracery	$2000	20#	Cybernetics
cathedra with white opal tracery	$2000	20#	Cybernetics
cathedra with black opal tracery	$2000	20#	Cybernetics
blast cannon	$2000	70#	Heavy Weapons
flawless crysteel shardmail	$1900	40#	Armor
leyline puppeteers	$1750	10#	Gloves
crystalline halo	$1666	5#	Helmets
crystalline jile	$1666	3#	Short Blades
black mote	$1666	0#	Floating Nearby
chassis plate	$1600	300#	Cloaks
zetachrome long sword	$1500	4#	Long Blades
zetachrome gloves	$1500	10#	Gloves
zetachrome halberd	$1500	9#	Axes
zetachrome pumps	$1500	10#	Footwear
zetachrome hammer	$1500	5#	Cudgels
zetachrome apex	$1500	8#	Helmets
zetachrome warhammer	$1500	9#	Cudgels
two-handed zetachrome long sword	$1500	8#	Long Blades
zetachrome battle axe	$1500	5#	Axes
Va'am's lens	$1500	15#	Shields
tri-hologram bracelet	$1500	1#	Bracelets
spaser pistol	$1500	8#	Pistols
Nacham's ribbon	$1500	8#	Cloaks
light rail	$1500	16#	Rifles
high-energy thermo cask	$1500	40#	Armor
Kah's loop	$1500	1#	Armlets
Dagasha's spur	$1500	30#	Hats
3D cobblers	$1400	5#	Footwear
zetachrome dagger	$1390	2#	Short Blades
chiral rings	$1250	10#	Floating Nearby
longreach grappling gun	$1250	4#	Pistols
high-voltage arc winder	$1250	4#	Pistols
enigma cone	$1250	28#	Armor
cloning draught	$1250	0.25#
phial of brain brine	$1233	1#
brain brine	$1233	0.25#
nullray pistol	$1200	5#	Pistols
crysteel shardmail	$1200	40#	Armor
hand rail	$1050	8#	Pistols
warm static	$1000	0.25#
sunslag	$1000	0.25#
phial of sunslag	$1000	1#
thermo cask	$1000	40#	Armor
salt kraken corpse	$1000	40000#	Corpses
neutron flux	$1000	2.5#
phial of neutron flux	$1000	3.5#
great saltback corpse	$1000	40000#	Corpses
gas tumbler	$1000	20#	Equipment
di-thermo beam	$1000	6#	Pistols
anti-gravity boots	$1000	4#	Footwear
chain laser	$1000	40#	Heavy Weapons
psychic meridian	$999	3#	Helmets
dazzle cheek	$999	1#	Masks
palladium mesh tabard	$925	9#	Cloaks
kaleidocera muffs	$900	11#	Gloves
kaleidocera cape	$900	11#	Cloaks
psychal fleshgun	$900	1#	Pistols
nano-neuro animator	$900	12#	Tools
kaleidocera krakows	$900	11#	Footwear
night-sight interpolators	$900	2#	Eyewear
helping hands	$900	20#	Backpacks
eigenrifle	$900	12#	Rifles
point-defense drone	$800	5#	Floating Nearby
gyrocopter backpack	$800	10#	Backpacks
nanoweave vest	$795	10#	Armor
plastifer chem vest	$750	20#	Armor
space inverter	$750	4#	Pistols
hypertractor	$750	28#	Rifles
geomagnetic disc	$750	1#	Thrown Weapons
linear cannon	$750	40#	Heavy Weapons

More...

Note for liquids, their base commerce is multiplied by 4 to have an integer weight.

Items sorted by Commerce/Weight

Item	Value per Pound
Item	Value per Pound
Hand-E-Nuke	10,000.0
Kesil Face	10,000.0
Shemesh Face	8,000.0
circle of light in the chord of Qas	7,500.0
circle of light in the chord of Qon	7,500.0
circle of light in the chord of Bethsaida	7,500.0
circle of light in the chord of Ehalcodon	7,500.0
circle of light in the chord of Shugruith	7,500.0
circle of light in the chord of Agolgot	7,500.0
circle of light in the chord of Rermadon	7,500.0
Earth Face	6,500.0
cloning draught	5,000.0
Levant Face	5,000.0
brain brine	4,932.0
Olive Face	4,000.0
Null Face	4,000.0
sunslag	4,000.0
warm static	4,000.0
timecube	3,000.0
mental aggregator	2,265.0
tri-hologram bracelet	1,500.0
Kah's loop	1,500.0
phial of brain brine	1,233.0
phial of sunslag	1,000.0
dazzle cheek	999.0
psychal fleshgun	900.0
geomagnetic disc	750.0
precision nanon fingers	700.0
zetachrome dagger	695.0
metamorphic polygel	600.0
crystalline jile	555.3333333333334
rainboweave cloak	535.0
Kindrish	500.0
scroll bound by a strand of kelp	500.0
n-pointed asterisk	500.0
military security card	500.0
quantum mote	500.0
crystal of Eve	475.0
night-sight interpolators	450.0
smooth peridot gemstone	420.0
smooth emerald gemstone	420.0
neutron flux	400.0
phase cannon	400.0
law-enforcement security card	400.0
symbiotic firefly	400.0
zetachrome long sword	375.0
stasis projector	360.0
smooth sapphire gemstone	360.0
transkinetic cuffs	350.0
rough emerald gemstone	350.0
arsplice seed	350.0
From Entropy to Hierarchy, 2nd Edition	350.0
rough peridot gemstone	350.0
flawless crysteel dagger	345.0
amaranthine prism	335.0
crystalline halo	333.2
psychic meridian	333.0
longreach grappling gun	312.5
high-voltage arc winder	312.5
Crime and Punishment	300.0
Eta and the Earthling, Canto I	300.0
From Entropy to Hierarchy	300.0
dream rondure	300.0
On the Origins and Nature of the Dark Calculus	300.0
zetachrome hammer	300.0
Modulo Moon Stair and the Tree of Life	300.0
rough sapphire gemstone	300.0
zetachrome battle axe	300.0
smooth amethyst gemstone	300.0
Disquisition on the Malady of the Mimic	300.0
emergency-services security card	300.0
phial of neutron flux	285.7142857142857
3D cobblers	280.0
merchant's token	250.0
minstrel's token	250.0
Slog's annunclus	250.0
anti-gravity boots	250.0
mercurial cloak	250.0
farmer's token	250.0
rough amethyst gemstone	250.0
Council at Gamma Rock	250.0
Schrodinger page from the Annals of Qud	250.0
onboard recoiler	240.0
nullray pistol	240.0
smooth jasper gemstone	240.0
reprogrammable recoiler	210.0
Across Moghra'yi, Vol. I: The Sunderlies	200.0
Frivolous Lives, Vol. I	200.0
Across Moghra'yi, Vol. III: Oth, the Free City	200.0
maintenance security card	200.0
rough jasper gemstone	200.0
gold nugget	200.0
Across Moghra'yi, Vol. II: Athenreach	200.0
floating glowsphere	200.0
jeweled sandals	200.0
stasis entangler	200.0
In Maqqom Yd	200.0
gold key	200.0
zetachrome apex	187.5
space inverter	187.5

More...

0 Weight Items sorted by Commerce

Item	Value
Item	Value
fermented tongue	$8
bone meal	$8
dream smoke	$8
dried vanta petals	$8
sun-dried banana	$8
psychal gland paste	$8
mirror dust	$8
ubernostrum injector	$75
luminous hoarshroom	$70
sliced bop cheek	$7
social coprocessor	$600
optical multiscanner	$600
electromagnetic sensor	$60
optical technoscanner	$60
Skillsoft [low sp]	$60
force modulator	$60
navigation system	$60
skin glitter	$60
optical bioscanner	$60
taco suprema	$500
albino ape heart	$50
ogre ape heart	$50
cybernetics credit wedge 2¢	$50
concentrated stillbeard gland paste	$5
cured dawnglider tail	$5
voider gland paste	$5
concentrated flamebeard gland paste	$5
flamebeard gland paste	$5
fermented yondercane	$5
fire ant gaster paste	$5
concentrated tartbeard gland paste	$5
fermented yuckwheat stem	$5
mazebeard gland paste	$5
tartbeard gland paste	$5
phase silk	$5
concentrated dreambeard gland paste	$5
dreambeard gland paste	$5
nullbeard gland paste	$5
gallbeard gland paste	$5
crushed grave moss	$5
mashed lag	$5
concentrated nullbeard gland paste	$5
concentrated sleetbeard gland paste	$5
concentrated mazebeard gland paste	$5
concentrated gallbeard gland paste	$5
sleetbeard gland paste	$5
stillbeard gland paste	$5
cybernetics credit wedge 3¢	$450
shade oil injector	$40
sphynx salt injector	$40
salve injector	$40
hulk honey injector	$40
blaze injector	$40
rubbergum injector	$40
skulk injector	$40
love injector	$40
congealed shade oil	$4
congealed love	$4
freeze-dried hoarshrooms	$4
pickled mushrooms	$4
congealed skulk	$4
Ekuemekiyyen greens	$4
spine fruit jam	$4
congealed salve	$4
congealed blaze	$4
spark tick plasma	$4
congealed rubbergum	$4
congealed hulk honey	$4
holographic visage	$360
penetrating radar	$360
Otherpearl	$33333
cybernetics credit wedge 2¢	$300
empty injector	$3
used injector	$3
desalination pellet	$25
cybernetics credit wedge 1¢	$25
Schemasoft [high-tier]	$240
phase-adaptive scope	$240
precision force lathe	$240
wild rice	$20
lover's blossom	$20
starapple jam	$2
plump mushroom	$2
dried lah petals	$2
pickles	$2
zetachrome arrow	$2
intravenous port	$180
equipment rack	$180
bionic liver	$180
Skillsoft [high sp]	$180
Skillsoft plus	$180
Schemasoft [mid-tier]	$180
dopamine synth	$180
custom visage	$180
black mote	$1666
cybernetics credit wedge	$150
inflatable axons	$120
skin glitter	$120
Schemasoft [low-tier]	$120
air current microsensor	$120

More...