Cor

Col (コル) is the form of currency in the world of Sword Art Online.

Methods of Acquiring
The valued currency of Sword Art Online is gathered swiftly from boss battles, as they yield a large amount of valuable loot, but the loot is usually shared among all participants of the boss battle. Other methods of acquiring col include killing monsters in dungeons or open fields, selling fruit that drop from trees (not a very efficient method, but it is favored by those who refuse to battle monsters), trading, Monster PK, and for orange guilds and players, ambushing other players and stealing their items and money in exchange for their lives.

Appearance and Denominations
Col can take the form of physical coins, known denominations include a silver coin worth 100 Col, a gold coin worth 500 Col, and a gold coin worth 100,000 Col. It is currently unknown how many types of coins exist in the game.

Inflation
Because the value of 1 Col is based on the drop rate maintained by the Cardinal System which is kept constant at all times, neither inflation nor depreciation ever happen in Aincrad.

When players sell items to NPCs, the Col is listed under the market price, so as to not produce inflation.

List of Known Values

 * 1 Col - The cheapest dry and unrefined black bread purchased from an NPC bakery.
 * 5 Col - The price of an edible fruit dropped by trees in the Starting City.
 * 10 Col - The price for an NPC to lead a player to the plaza of the Algade if they are lost.
 * 10 Col - The price of a cup of fire-breathing popcorn, sold during Heathcliff and Kirito's duel.
 * 30 Col - The amount of Col that can be obtained by defeating a single worm in the field.
 * 30 Col - The amount of Col that can be obtained by defeating a single Frenzy Boar in the field.
 * 50 Col - The price of renting a room in a 1st Floor Inn for one night (less than 6 jō tatami mats or 100 square ft). Comes with one bed and a table.
 * 50 Col - The price for taking a gondola ride on the 4th Floor.
 * 80 Col - The price of renting the second floor of an NPC farmer's house in Tolbana Town for one night. Comes with two rooms (each larger than 20 jō), a large bed room with a good view, a bathroom, and free milk.
 * 100 Col - The estimated daily rent for a guest room in the Starting City's church.
 * 180 Col - The amount of Col that can be obtained by defeating a Killer Mantis in the field.
 * 100 Col - The cost of Lisbeth polishing Asuna rapier.
 * 1,000 Col - The amount of Col that can be obtained by defeating a Lizardman Lord on the 74th Floor.
 * 16,000 Col - The price of a new Anneal Blade +0 a few days after the first floor was cleared.
 * 100,000 Col - The estimated minimum ​purchase price for the rare Ragout Rabbit's Meat from another lucky player (such as the meat Kirito obtains with a Throwing Pick).
 * 100,000 Col - The minimum price of a custom-made weapon made using special ingredients by Lisbeth.
 * 1,000,000 Col (1 Mega Col) - The cost of a "fairly spacious place" in a neighborhood of Mishe, the main town of the 35th Floor.
 * 1,000,000 Col (1 Mega Col) - The cost of a glass of rare wine, after the drop rate of the wine was patched.
 * 3,000,000 Col (3 Mega Col) - The cost of a support-class small house with a waterwheel in Lindas.
 * 4,000,000 Col (4 Mega Col) - The cost of Asuna's 1LDK furnished house in Selmburg.
 * 5,000,000 Col (5 Mega Col) - A Log House on the 22nd floor.
 * 1,000,000,000 Col (1 Giga Col) - Said to be the cost of the KoB's headquarter tower.

Trivia

 * Col is an abbreviation for "coin of radius", which most likely means "currency of Aincrad."
 * In the 4-koma manga, the spelling of the currency was COR.

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