store might not make up for the expense in checking the other store (gas, time, effort, etc.), it's simple and quick to search for other values of a card you'd like to buy or sell online. This ensures competition where all prices move quickly towards the market price. One inefficiency that the market does have is that since the ticket is the main unit of in-game currency, the bid–ask spread on cards is effectively fixed at one ticket. This makes buying and selling of cards quickly somewhat inefficient; other effects are that cards which cost less than a ticket must be offered in bulk (or else as standard barters). There are at any given time a large number of online 'bots', which are vendors who offer prices for buying and selling digital objects down to the hundredth of a ticket (maintaining a balance on account of fractional tickets for users where needed). Furthermore, in August 2009 the limit of cards allowed per trade was raised from 32 to 75, allowing much more flexibility. This limit was raised further in 2013 to allow for a maximum of 400 cards per trade. Automated trading Magic Online has accumulated a secondary market composed of automated traders, which have become the most common way to obtain cards. These traders, known as "bots", are accounts running programs designed to trade cards at variable prices and qualities. A simple bot might be one that will buy any three rares for one ticket, and offer any two rares it has for a ticket. More complicated bots can maintain detailed price lists and notice trends; for example, if many traders are selling one particular card, that is a clue that the bid price is too high, and it should either stop buying that card or automatically lower the price it bids for it. Lastly, some bots are designed to help advertise competing sellers' prices and give users a general sense of the values of cards they have. Tournament effects on the market Drafters and their recently acquired cards represent a main source of singles to the market. Winners in any tournament usually get balanced amounts of the packs used to enter; for example, someone who won 3 packs in an Onslaught-Onslaught-Legions draft would receive 2 packs of Onslaught and 1 pack of Legions. Conveniently, this is exactly what would be required to do a similar event again, along