This article has information that is missing or not up to par.
Reason: What does commerce have to do with book experience? also, this info is better on other pages.
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
If the player has Glotrot, Ego modifier and Snake oiler no longer have an effect and returns a flat -3. The equation then becomes
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 or -2 Ego modifier with Socially Repugnant).
When buying an item from a trader, this multiplier is divided by the value of the item in question. When the item is sold, the value is multiplied by the multiplier.
Sacred Well Reputation Formula
How much reputation the Sacred well gives is also dependent on the commerce value of the object.
Reputation cannot go lower than 1, and if an object that has no specified value defaults to 10 reputation.
Book Experience Formula
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
| Page | Commerce | Category |
| Page | Commerce | Category |
| Otherpearl | 33,333.0 | Bracelets |
| Kesil Face | 10,000.0 | Masks |
| Hand-E-Nuke | 10,000.0 | Grenades |
| Shemesh Face | 8,000.0 | Masks |
| Circle of light in the chord of Ehalcodon | 7,500.0 | Floating Nearby |
| Circle of light in the chord of Agolgot | 7,500.0 | Floating Nearby |
| Circle of light in the chord of Rermadon | 7,500.0 | Floating Nearby |
| Circle of light in the chord of Qas | 7,500.0 | Floating Nearby |
| Circle of light in the chord of Bethsaida | 7,500.0 | Floating Nearby |
| Circle of light in the chord of Shugruith | 7,500.0 | Floating Nearby |
| Circle of light in the chord of Qon | 7,500.0 | Floating Nearby |
| Flange from the Great Machine | 6,666.0 | Armor |
| Gauge from the Great Machine | 6,666.0 | Masks |
| Sail from the Great Machine | 6,666.0 | Cloaks |
| Gear from the Great Machine | 6,666.0 | Shields |
| Earth Face | 6,500.0 | Masks |
| Zetachrome lune | 6,000.0 | Armor |
| Levant Face | 5,000.0 | Masks |
| Olive Face | 4,000.0 | Masks |
| Null Face | 4,000.0 | Masks |
| Mecha power core | 4,000.0 | Items |
| Swarm rack | 3,200.0 | Heavy Weapons |
| Timecube | 3,000.0 | Trinkets |
| Mental aggregator | 2,265.0 | Helmets |
| Psychodyne helmet | 2,140.0 | Helmets |
| Transkinetic cuffs | 2,100.0 | Bracelets |
| Cathedra with white opal tracery | 2,000.0 | Cybernetics |
| Cathedra with ruby tracery | 2,000.0 | Cybernetics |
| Spaser rifle | 2,000.0 | Rifles |
| Blast cannon | 2,000.0 | Heavy Weapons |
| Cathedra with sapphire tracery | 2,000.0 | Cybernetics |
| Cathedra with black opal tracery | 2,000.0 | Cybernetics |
| Phase cannon | 2,000.0 | Heavy Weapons |
| Fist of the Ape God | 2,000.0 | Cudgels |
| Flawless crysteel shardmail | 1,900.0 | Armor |
| Leyline puppeteers | 1,750.0 | Gloves |
| Black mote | 1,666.0 | Floating Nearby |
| Crystalline jile | 1,666.0 | Short Blades |
| Crystalline halo | 1,666.0 | Helmets |
| Chassis plate | 1,600.0 | Cloaks |
| Light rail | 1,500.0 | Rifles |
| Kah's loop | 1,500.0 | Armlets |
| High-energy thermo cask | 1,500.0 | Armor |
| Zetachrome warhammer | 1,500.0 | Cudgels |
| Zetachrome long sword | 1,500.0 | Long Blades |
| Zetachrome pumps | 1,500.0 | Footwear |
| Zetachrome battle axe | 1,500.0 | Axes |
| Va'am's lens | 1,500.0 | Shields |
| Nacham's ribbon | 1,500.0 | Cloaks |
| Spaser pistol | 1,500.0 | Pistols |
| Two-handed zetachrome long sword | 1,500.0 | Long Blades |
| Tri-hologram bracelet | 1,500.0 | Bracelets |
| Zetachrome hammer | 1,500.0 | Cudgels |
| Zetachrome halberd | 1,500.0 | Axes |
| Zetachrome apex | 1,500.0 | Helmets |
| Zetachrome gloves | 1,500.0 | Gloves |
| Dagasha's spur | 1,500.0 | Hats |
| 3D cobblers | 1,400.0 | Footwear |
| Zetachrome dagger | 1,390.0 | Short Blades |
| Longreach grappling gun | 1,250.0 | Pistols |
| High-voltage arc winder | 1,250.0 | Pistols |
| Chiral rings | 1,250.0 | Floating Nearby |
| Enigma cone | 1,250.0 | Armor |
| Crysteel shardmail | 1,200.0 | Armor |
| Nullray pistol | 1,200.0 | Pistols |
| Hand rail | 1,050.0 | Pistols |
| Gas tumbler | 1,000.0 | Equipment |
| Di-thermo beam | 1,000.0 | Pistols |
| Chain laser | 1,000.0 | Heavy Weapons |
| Thermo cask | 1,000.0 | Armor |
| Anti-gravity boots | 1,000.0 | Footwear |
| Dazzle cheek | 999.0 | Masks |
| Psychic meridian | 999.0 | Helmets |
| Palladium mesh tabard | 925.0 | Cloaks |
| Helping hands | 900.0 | Backpacks |
| Kaleidocera muffs | 900.0 | Gloves |
| Kaleidocera cape | 900.0 | Cloaks |
| Nano-neuro animator | 900.0 | Tools |
| Eigenrifle | 900.0 | Rifles |
| Night-sight interpolators | 900.0 | Eyewear |
| Kaleidocera krakows | 900.0 | Footwear |
| Psychal fleshgun | 900.0 | Pistols |
| Point-defense drone | 800.0 | Floating Nearby |
| Gyrocopter backpack | 800.0 | Backpacks |
| Nanoweave vest | 795.0 | Armor |
| Laser rifle | 750.0 | Rifles |
| Plastifer chem vest | 750.0 | Armor |
| Geomagnetic disc | 750.0 | Thrown Weapons |
| Freeze ray | 750.0 | Rifles |
| Hypertractor | 750.0 | Rifles |
| Space inverter | 750.0 | Pistols |
| Linear cannon | 750.0 | Heavy Weapons |
| Arc winder | 750.0 | Pistols |
| Flawless crysteel warhammer | 720.0 | Cudgels |
| Flawless crysteel great sword | 720.0 | Long Blades |
| Flawless crysteel battle axe | 720.0 | Axes |
| Flawless crysteel mace | 720.0 | Cudgels |
| Flawless crysteel long sword | 720.0 | Long Blades |
| Flawless crysteel halberd | 720.0 | Axes |
| Precision nanon fingers | 700.0 | Gloves |
More...