Abstract:
Systems and methods for electronic trading that provide incentives to users of a trading system. The systems and methods may monitor a trading activity of the user and determine that the orders submitted by the user over a period of time exceed a first pre-determined threshold. Systems and methods also determine that a spread of the plurality of orders exceeds a second pre-determined threshold. Based on these determinations, the user is designated as qualifying for a special status, which entitles the user to incentives in trading. Systems and methods apply the incentives to an order submitted by the user. One such incentive provides the user with a priority in a trading queue, where orders submitted by the user are executed in advance of other orders in the trading queue.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is a continuation of U.S. patent application Ser. No. 12/852,762, filed Aug. 9, 2010 entitled “System And Method That Provide Incentives to Qualified Users of an Electronic Trading System,” which is a continuation of U.S. patent application Ser. No. 12/137,107, filed Jun. 11, 2008 entitled “Systems and Methods for Electronic Trading that Provide Incentives and Linked Auctions”, (now U.S. Pat. No. 7,797,227 issued on Sep. 14, 2010), which is a divisional of U.S. patent application Ser. No. 09/593,554, filed on Jun. 14, 2000 (now U.S. Pat. No. 7,401,044 issued on Jul. 15, 2008), entitled “Systems And Methods For Electronic Trading That Provide Incentives And Linked Auctions,” which claims the benefit of priority of U.S. Provisional Application Ser. No. 60/139,344, filed Jun. 15, 1999, entitled “Systems And Methods For Auctioning,” which are incorporated by reference herein in their entirety. 
     
    
     BACKGROUND OF THE INVENTION 
       [0002]    The present invention relates to systems and methods for electronic trading that provide incentives and linked auctions. More particularly, the present invention relates to systems and methods for electronic trading that provide incentives for gathering orders, making markets, and submitting block orders, and that enable linking of multiple trading auctions. 
         [0003]    In recent years, electronic trading systems have gained wide spread acceptance for trading a wide variety of goods, services, and financial instruments. For example, electronic trading systems have been created which facilitate the trading of financial instruments and commodities such as stocks, bonds, currency, futures, oil, gold, pork bellies, etc. As another example, online auctions on the Internet have become popular markets for the exchange of services and both new and used goods. In one embodiment of systems for electronic trading of financial instruments, for example, a first trader may submit a “bid” to buy a particular number of 30 Year U.S. Treasury bonds at a given price. In response to such a bid, a second trader may “hit” the bid in order to indicate a willingness to sell bonds to the first trader at the given price. Alternatively, the second trader may submit an “offer” to sell the particular number of the bonds at the given price, and then the first trader may “take” or “lift” the offer to indicate a willingness to buy bonds from the second trader at the given price. 
         [0004]    Advantages to trading electronically include enabling traders to remain anonymous for at least a portion of the trading process, facilitating trading among traders at different physical locations, and improving the accuracy of documenting trading activity. Nevertheless, as with any method for trading, electronic trading needs to be sufficiently efficient to prevent the costs of trading electronically from overshadowing its benefits, and sufficiently liquid in order to truly reflect the market price of items being electronically traded. 
         [0005]    One way in which efficiency and liquidity can be improved in any trading system is by increasing the volume of orders in the trading system, increasing the amount of time during which a market is available for orders to be executed, and enabling items to be simultaneously traded independently of each other. Thus, it would be desirable to provide systems and methods which increase the volume of orders in the trading system, increase the amount of time during which a market is available for orders to be executed, and enable items to be simultaneously traded independently of each other. 
       SUMMARY OF THE PRESENT INVENTION 
       [0006]    It is therefore an objective of the present invention to provide systems and methods which increase the volume of orders in the trading system, increase the amount of time during which a market is available for orders to be executed, and enable items to be simultaneously traded independently of each other. 
         [0007]    The above and other objects of the invention are realized by providing systems and methods for electronic trading that provide incentives for gathering orders, making markets, and submitting block orders, and that enable linking of multiple auctions. In order to give a trader using the systems and methods of the present invention an incentive to gather orders, make markets and submit block orders, these systems and methods may first determine if the trader qualifies for an incentive. This determination may be made in real-time and may be based upon one or more characteristics, such as price, size, duration, etc., of orders submitted to the trading system by the trader. Once the trader has been determined as being eligible for one or more incentives, the incentives that are provided may include reduced transaction costs, cash payments, priority or exclusivity in trading, self execution of transactions, creation of linked auctions, etc. The invention may also permit a trader to view information about the incentive earned by that trader periodically or in real time. 
         [0008]    With regard to linked auctions, before an order is eligible to be traded in a linked auction, the order is preferably confirmed as qualifying to be auctioned in such a manner. Once an order is confirmed as qualifying for its own auction, a linked auction is created and preferably linked to another auction based upon a characteristic of the order, such as price. In addition to being linked, information from each auction may be made available to traders in the other auctions. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0009]    The above and other objects and advantages of the invention will be apparent upon consideration of the following detailed description, taken in conjunction with the accompanying drawings, in which like reference characters refer to like parts throughout, and in which: 
           [0010]      FIG. 1  is a block diagram of one embodiment of a hardware arrangement in accordance with the present invention; 
           [0011]      FIG. 2  is a flow diagram of a main process in accordance with one embodiment of the present invention; 
           [0012]      FIG. 3  is a flow diagram of a process for qualifying a trader for incentives for gathering orders in accordance with one embodiment of the present invention; 
           [0013]      FIG. 4  is a flow diagram of a process for qualifying a trader for incentives for making markets in accordance with one embodiment of the present invention; 
           [0014]      FIG. 5  is a flow diagram of a process for allocating incentives to traders in accordance with one embodiment of the present invention; 
           [0015]      FIG. 6  is a flow diagram of a process for processing block orders in accordance with one embodiment of the present invention; 
           [0016]      FIG. 7  is a flow diagram of a process for linking separate auctions of items in accordance with one embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0017]    As stated above, the present invention provides systems and methods for electronic trading that provide incentives to traders for gathering orders, making markets, and submitting block orders, and that enable linking of multiple auctions. Although the present invention is described herein as providing incentives to “traders” and being used by traders, it should be apparent that the term “trader” is meant to broadly apply to any user of a trading system, whether that user is an agent acting on behalf of a principal, a principal, an individual, a legal entity (such as a corporation), etc., or any machine or mechanism that is capable of placing and/or responding to orders in a trading system. 
         [0018]    Preferred embodiments of the systems and methods of the present invention are now described in greater detail in connection with  FIGS. 1-7 . In the examples which follow, trading of U.S. Treasury bonds, notes, and bond futures are used to illustrate various aspects of the present invention. Trading of these instruments may be accomplished in both typical and block sizes delineated in prices relative to par. For example, a price may be quoted as $123 1/32 or $123.03125 per $100,000 face value for 8% U.S. Treasury Bond futures for delivery in September 2000 or $123,031.25 of futures contract value. Due to display limitations in typical trading workstations, a price of $123 1/32 may be displayed as “123.01” where the tenths and hundreths digits represent the number of 32nds. A 32nd is frequently referred to as a “tick”. When a market is displayed for trading of such bond futures, the market may be shown as “101.02-03 5×25” where “101.02” is the bid price, “101.03” is the offer price, 5 million is the bid size, and 25 million is the offer size. 
         [0019]    Notwithstanding that the present invention is illustrated with respect to trading of bonds, notes, and bond futures, it should be noted that the systems and methods of the present invention are equally applicable to the trading of any type of financial instruments, commodities, goods, services, etc. 
         [0020]    Turning first to  FIG. 1 , an example of hardware  100  that may be used to implement one embodiment of the present invention is shown. As illustrated, hardware  100  may include one or more local workstations  102  and one or more remote workstations  104  that may be used by traders to view trading data and enter trading commands. Workstations  102  and  104  may be any suitable means for presenting data and, in preferred embodiments of this invention, accepting input. For example, workstations  102  and  104  may be personal computers, laptop computers, mainframe computers, dumb terminals, data displays, Internet browsers, Personal Digital Assistants (PDAs), two-way pagers, wireless terminals, portable telephones, etc., or any combination of the same. 
         [0021]    To orchestrate trading between traders using workstations  102  and  104 , the workstations preferably submit commands to, and receive data to be displayed from, a processor  106 . In alternative embodiments, however, workstations may communicate with additional processors, or include processors to orchestrate trading in a distributed fashion without requiring processor  106 . Processor  106 , and any additional processors, may be any suitable circuitry or devices capable of processing data such as microprocessors, personal computers, network servers, mainframe computers, dedicated computer systems, etc. 
         [0022]    As shown, processor  106  may be connected to workstations  102  and  104  by networks  108  and  110 , respectively. Each of networks  108  and  110  may be any suitable data network for communicating data between workstations  102  and  104  and processor  106 , such as a local area network, a wide area network, the Internet, an intranet, a wireless network, a hard wired connection, a dial-up network, etc., or any combination of the same. In an arrangement of hardware  100  without processor  106 , workstations  102  and  104  may be linked together by networks  108  and  110  directly. 
         [0023]    As also shown in  FIG. 1 , a telephone network  120  may be provided that comprises a local telephone  122  and a remote telephone  124  connected by a telephone line  126 . Telephone network  120  may be used to enable a trader at a remote location to communicate with an operator at a workstation  102  or  104 . This may be useful when the trader does not have access to a workstation  102  or  104  or when the trader only has access to a display-only workstation  102  or  104 . Obviously, telephone network  120  may be implemented as a private telephone network, a public telephone network, a wireless telephone network, or any suitable combination of the same. 
         [0024]    When used to implement a bid/offer, hit/take trading system as described above, hardware  100  may enable a trader to submit a bid to buy, or an offer to sell, an item at one of workstations  102  and  104 . This bid or offer may then be communicated to processor  106 , where the bid or offer can be ranked and stored in a bid-offer queue. The ranking may be based upon time of submission, price, or any other suitable criterion. The bid or offer may then be presented to other traders via other workstations  102  and  104  dependent upon its ranking in the bid-offer queue. Once displayed, the bid or offer can then be hit or taken by one or more of the other traders so that a trade of the item can proceed to execution. 
         [0025]    Referring to  FIG. 2 , a process  200  for implementing one embodiment of the present invention in hardware  100  is illustrated. As shown, once process  200  has begun at step  202 , a trader may be admitted at step  204 . This admission may include verifying the identity of the trader, initializing related accounts of the trader, and/or any other related functions. Next, process  200  may determine whether the trader qualifies for incentives for gathering orders at step  206  (as discussed in greater detail in connection with  FIG. 3 ) and whether the trader qualifies for incentives for making markets at step  208  (as discussed in greater detail in connection with  FIG. 4 ). Although steps  206  and  208  are illustrated as being performed concurrently in process  200 , these steps may be performed sequentially and in any order in accordance with the present invention. To a trader to know what incentives have been earned by the trader, the present invention, at step  209 , preferably updates a list of incentives that have been earned by the trader and makes that list available to the trader on demand when using one of workstations  102  and  104 . Once step  209  has been completed, process  200  receives bids and/or offers as orders at step  210 . Next at step  212 , process  200  allocates the orders to traders and provides incentives qualified for by the traders (as discussed in greater detail in connection with  FIG. 5 ). For orders that qualify as block orders, process  200  applies block order trading rules at step  214  (as discussed in greater detail in connection with  FIG. 6 ). For orders that qualify to be traded in a linked auction, process  200  creates and links a new auction for the order to another auction at step  216  (as discussed in greater detail in connection with  FIG. 7 ). Finally, process  200  performs the appropriate auctions for orders at step  218  and loops back to steps  206  and  208 . 
         [0026]    Process  200  shown in  FIG. 2  is only meant to illustrate one possible implementation of the present invention. Alternative embodiments may not follow the depicted flow. For example, determinations of whether a trader qualifies for incentives for gathering orders and/or making markets may be made at random intervals rather than regular intervals as shown in  FIG. 2 . 
         [0027]    Turning to  FIG. 3 , a process  300  for determining whether a trader qualifies for incentives for gathering orders is illustrated. Gathering orders, or generating order flow, is important in a trading system because as the number of orders in the system increases, so does the liquidity in the system. As stated above, liquidity in a trading system is important for establishing the true market price for an item to be traded in that system. Determining whether a trader qualifies for incentives for generating order flow may include satisfaction of one or more of the following criteria: 
         [0028]    (1) that the trader have sufficient credit acceptability; 
         [0029]    (2) that the trader be sponsored by one or more other traders, an exchange, or an exchange&#39;s clearing corporation; 
         [0030]    (3) that the trader meet certain value levels; and 
         [0031]    (4) that the trader satisfy order placement and cancellation levels. 
         [0032]    Determining whether a trader qualifies for an incentive for gathering orders is preferably performed at two times. First, the determination may be performed prior to participation, for example, by verifying credit acceptability or sponsorship by one or more other traders, an exchange, or an exchange&#39;s clearing corporation. Second, the determination may be performed during trading, for example, by monitoring, in real-time, the participation levels of bids and offers and the quality of those bids and offers (e.g., duration of time the order is exposed to the market and the frequency of cancellation commands). The latter is important because, for example, a bid order that lasts for only one second may be too short in duration to enable another trader to hit the bid and and therefore tend to create noise on the other trader&#39;s display rather than reveal an intention to complete a transaction. This sort of noise should not entitle a trader to an incentive. 
         [0033]    The determination of whether a trader qualifies for incentives for gathering orders may also be based upon the type of orders gathered, the time of entry of orders, the volume of entry of orders, the size of entries in the orders, and/or the characteristics of the originators of the orders gathered by the trader. For example, a trader may qualify for different incentives for bids versus orders, and for different incentives when a bid or offer is placed versus when a trade clears. Furthermore, the test used to determine whether a trader qualifies for incentives may be dynamically varied (e.g., based upon market conditions), and may be particular to a particular trader or group of traders. 
         [0034]    If a trader fails to meet the necessary criteria for receiving incentives, then qualification may not be granted or may be revoked. However, if a trader does qualify for incentives, the trader may be designated as a Qualified Order Gatherer (QOG) and provided with incentives that may include various trading privileges including reduced or no transaction costs, payment of a fixed amount of money, transaction based payments (e.g., commissions), priority in a bid/offer queue, priority or exclusivity to bids/offers, etc. 
         [0035]    As stated above, a process  300  for determining whether a trader qualifies for incentives for gathering orders is illustrated in  FIG. 3 . As shown, once process  300  has begun at step  302 , the process may check the credit of the trader at step  304  and the sponsorship of the trader at step  306 . Credit and sponsorship of a trader may be checked only once upon admission of the trader or may be checked each time process  300  is performed in the event that credit and sponsorship information is updated in real time. Next, process  300  may determine at step  308  if the trader is actively trading. The criteria used to determine whether a trader is actively trading may vary. For example, a trader may be considered active if it has placed at least a minimum number of orders during a window of time. Alternatively, a trader may be considered active if no more than a predetermined minimum of time has elapsed since the time that the last order was placed by the trader. If the trader is trading, then process  300  monitors levels of participation and the quality of bids and offers at step  310 . If the trader is not trading or after step  310  has been completed, process  300  assigns a qualification rating to the trader at step  312  and terminates at step  314 . 
         [0036]      FIG. 4  illustrates one embodiment of a process  400  for determining whether a trader qualifies for incentives for making markets in accordance with the present invention. To determine whether a trader qualifies for these incentives, preferred embodiments of the invention may confirm that the trader has been making bids and offers that have at least a minimum designated volume and that have a spread (difference in price between bid and offer) that meets or beats one or more parameters. For example, to be entitled to incentives, a trader may be required to provide substantially continuous bid and offer prices having spreads that fall within a given set of limits. The limits, in this example, may require a one tick (i.e., 1/32 or 0.03125) price spread for bids and offers over the course of 50% of the trading day. Alternatively, a trader may qualify for incentives for merely making one side of a market (e.g., the bid or offer side). 
         [0037]    Obviously, in accordance with the present invention, a wide variety of tests or combination of tests may be used to determine whether a trader qualifies for incentives for making markets, including monitoring the price, size, duration, and cancellation of bids and offers submitted by the trader, the credit worthiness of the trader, etc. Moreover, this test or these tests may be applied to a trader only once, periodically, or in real time. 
         [0038]    In preferred embodiments, a trader meeting the market making qualification test may then be entitled to incentives and designated as a Designated Primary Market Maker (DPMM), and a trader failing to meet this test may not be granted incentives and DPMM status or may have an entitlement to those incentives and DPMM status revoked. Incentives may include various trading privileges including reduced or no transaction costs, payment of a fixed amount of money, transaction based payments (e.g., commissions), priority in a bid/offer queue, priority or exclusivity to bids/offers, etc. 
         [0039]    Because a DPMM may play a dual role as both an order gatherer for other traders and as a principal for its own account, the DPMM may also be granted the option of executing certain transactions itself. For example, assume that an auction process in the trading system has a bid for $50 million at a price of 101.01 and an offer for $25 million at a price of 101.02, wherein the offer is made up in part of an offer for $5 million at 101.02 by a DPMM. Then, a customer bid order comes into the DPMM for $5 million at a bid price of 101.02. In the auction process, this new better bid would lock the market at 101.02-02 5×25. However, a trade might not take place because there is no bid/offer and hit/take combination. Nevertheless, because the DPMM has both a bid (the customer&#39;s) and an offer (the DPMM&#39;s) that match, a trade execution may be permitted to be instituted by the DPMM externally to the auction process. 
         [0040]    As another example, a DPMM may be provided with the ability to initiate private auctions for orders as an incentive for making markets. In preferred embodiments of the invention, these auctions may be linked to a main auction as described in connection with  FIG. 7 . 
         [0041]    The DPMM may also be given control over the option to execute transactions so that the DPMM retains a percentage of the orders for execution or passes them on to an auction process in the trading system. The invention is not limited to any one order allocation scheme and can be dynamic in nature, e.g., orders may be retained when the market is active. To facilitate the option chosen, the auction process in the trading system is preferably linked to an auction process of the DPMM. While the auction process in the trading system may use an interactive trading system, wherein bids and offers that are placed may be hit and taken, respectively, to initiate trades, the DPMM may invoke a different matching algorithm (or any other suitable method for trading) for its own customers&#39; orders. 
         [0042]    As stated above, a process  400  for determining whether a trader qualifies for incentives for making markets is illustrated in  FIG. 4 . After process  400  has begun at step  402 , the process monitors bids, offers, and spreads of a trader at step  404 . Next, at step  406 , process  400  determines if the trader qualifies as a DPMM. If the trader does not qualify, incentives may not be granted or may be revoked and process  400  terminates at step  414 . If the trader does qualify as a DPMM, however, process  400  next determines at step  408  whether the DPMM is entitled to an incentive. If the DPMM is not entitled to an incentive, process  400  terminates at step  414 . If the DPMM is entitled to an incentive, process  400  may then give the trader statuses such as reduced or no transaction cost status at step  410  and trade execution status at step  412  to facilitate receipt of the corresponding incentive. Naturally, other statuses for incentives may additionally or alternatively be granted in accordance with the present invention. Once these statuses have been given, process  400  terminates at step  414 . 
         [0043]    After a trader has been determined as qualifying for incentives for either gathering orders or making markets, the systems and methods of the present invention may then provide the corresponding incentives to the trader. As stated above, these incentives may include various trading privileges including reduced or no transaction costs, payment of a fixed amount of money, transaction based payments, priority in a bid/offer queue, priority or exclusivity to bids/offers, ability and option to execute trades, etc. For example, one form of an incentive that may be granted is a priority in the bid-offer queue. Such a priority may increase the probability that a transaction will be completed for a trader. 
         [0044]    In the event that two or more traders are simultaneously entitled to a priority incentive, the present invention may either allocate the incentive to each trader at a different time (e.g., sequentially based upon which trader became entitled to the priority first), or allocate the incentive to the traders concurrently. For example, in the latter case, if a trader wants to buy $10 million of the most recently auctioned 5 year treasury notes, and a first DPMM and a second DPMM each desire to sell $10 million, then the trader will buy $5 million from the first DPMM and $5 million from the second DPMM. Alternative allocations of priority to the DPMMs are also possible, e.g., random selection full priority to one of the DPMMs from among the group of DPMMs. 
         [0045]    Similarly, when different types of incentives are due to different traders, the present invention may provide one of the incentives to one of the traders at the expense of the other. For example, assume that an order comes into a QOG from a trader to buy $10 million of the most recently auctioned 5 year treasury notes at the market price. The trading system may allow the QOG to fill some portion of the order (e.g., 60%), notwithstanding a priority held by a DPMM. Once the QOG has filled a portion of the order, the DPMM may then be permitted to fill a remaining portion of the order (e.g., the remaining 40%). 
         [0046]    How incentives are allocated to traders concurrently entitled thereto may be a function of trade size, time of day, trader type, order type, execution performance, etc., or any combination of the same. 
         [0047]    One example of a process for allocating incentives to traders in accordance with the present invention is illustrated in  FIG. 5 . As shown, once process  500  has begun at step  502 , the process retrieves the QOG qualification rating and DPMM statuses of a trader in question. The QOG qualification rating may be determined by a process such as process  300  which is described above and illustrated in  FIG. 3 , and the DPMM statuses may be determined by a process such as process  400  which is described above and illustrated in  FIG. 4 . Next at step  506 , process  500  determines if the trader qualified for incentives as a DPMM. If the trader did qualify for one or more incentives as a DPMM, then process  500  provides the corresponding incentives to the trader at step  508 . However, if the trader did not qualify for incentives or after a DPMM incentive has been allocated to the trader, process  500  then determines at step  510  if the trader qualified for incentives as a QOG. If the trader did qualify for one or more incentives as a QOG, then process  500  provides the corresponding incentives to the trader at step  512 . Finally, if the trader did not qualify for incentives or after a QOG incentive has been allocated to the trader, then process  500  terminates at step  514 . 
         [0048]    Turning to  FIG. 6 , a process  600  for processing block orders in accordance with one embodiment of the present invention is illustrated. Block orders are orders that may be traded outside the normal market for that type of order, typically because of the size of the order. For example, when a first trader desires to trade an extraordinarily large size of bonds, that trader may be permitted to submit an order requesting that another trader bid or offer their best price for those bonds rather than requiring that the first trader submit a bid or offer order for the bonds. In this way, the block order is entitled to preferential treatment because of its size. 
         [0049]    For an order to qualify as a block order, a variety of tests may be performed on the order. For example, the order may have to be for a certain instrument, for at least a certain size, for at least a certain minimum or at most a maximum price, etc. Once an order qualifies as a block order, the order may then be entitled to preferential treatment. In addition to qualifying orders as block orders, the present invention may also apply delineators to the block order to control the price range, size range, time components (e.g., a minimum period for which the block must be available to be hit/taken), etc. of the order. 
         [0050]    For example, a price range delineator may only allow a trade for a block order at a particular time to be consummated between prices of 101.01 and 101.02. As another example, upper and lower bounds may limit the range associated with the spread for a block order between the best bid (highest bid) and best offer (lowest offer) for similar items. As a more particular example, the present invention may generate a lower bound and an upper bound that are one tick below and one tick above, respectively, the minimum one tick spread. In the example above, assume the best bid was 101.01 and the best offer was 101.02, for a spread of 0.01. The upper bound would then be 101.03 and the lower bound would be 101.00. Setting the upper and lower bound in this way has the effect of widening the permissible range within which a DPMM could execute a block trade. Further to the above example, if an order came into a DPMM to buy $25 million of the most recently auctioned U.S. Treasury notes while the best bid and best offer were 101.01 and 101.02, respectively, for $5 million on each side, then the DPMM could fill the $25 million order directly at a price of 101.03 since the $25 million order would be a qualified block order. 
         [0051]    As stated above, one example of a process for processing block orders in accordance with the present invention is illustrated in  FIG. 6 . As shown, once process  600  has begun at step  602 , the process determines at step  604  whether the order qualifies as a block order. As mentioned above, this determination may be based upon the order instrument, price, size, etc. If the order does qualify as a block order, process  600  determines if any delineators apply to this order at step  606 , otherwise process  600  will terminate at step  614 . If the order does qualify as a block order and no delineators apply to the order, then the order is designated as a block order at step  612  and process  600  terminates at step  614 . If the order does qualify as a block order and delineators do apply to the order, however, the delineators are then determined at step  608 . Next, process  600  determines if the order complies with the delineators at step  610 . If the order does not comply, then process  600  terminates at step  614 . Otherwise, the order is designated as a block order at step  612  and process  600  terminates at step  614 . 
         [0052]    If after process  600 , an order is designated as a block order, then the order may be treated as a block in a subsequent auction process such as that illustrated in step  218  of  FIG. 2 . 
         [0053]    As mentioned above, liquidity and transaction volume can be enhanced by allowing multiple simultaneous buy/sell transactions to take place should the corresponding market situation arise. By allowing more than one transaction or auction process, efficiencies in the trading system can be achieved. 
         [0054]    For example, assume that a first trader and a second trader are working-up a trade (i.e., adding additional size to a trade that has already initially been completed as part of an auction) by buying and selling in increments of $5 million of the most recently auctioned five year U.S. Treasury note. At the same time, a DPMM receives an order to buy $5 million worth of the same note from a third trader. By granting an incentive to the DPMM, a private auction may be permitted to take place between the DPMM and the third trader at the same time that the auction between the first trader and the second trader is progressing. By allowing two auction processes to coexist within one market, at the same time, greater liquidity and market efficiency can be attained. 
         [0055]    Preferred embodiments of the present invention allow multiple auction processes to occur at the same time while linking one or more of their characteristics. These multiple auction processes may all be occurring in processor  106  (see  FIG. 1 ) or some may be occurring in a processor external but linked to processor  106 . The particular method for performing each of the multiple auction processes may be the same or different. For example, the auction process may all use interactive matching, wherein bids and offers are hit and taken, respectively, by an aggressor. Alternatively, one auction process may use interactive matching while another auction process uses another form of matching. Other types of multiple auction processes may also be linked. 
         [0056]    Linking of the multiple auction processes preferably requires that some aspect of the auction processes other than a main auction process be controlled by the main auction process. For example, the main auction process may control the price range, size range, time components, etc. of transactions in the other auction processes. As a more particular example, the price range for items in a second auction process may be required to remain within the range of prices in the main auction process. Additionally, information from any auction (e.g., price, size, time, etc.) may be conveyed to traders in other auctions in preferred embodiments of the present invention. In this way, traders can become aware of the best bids/offers or a concurrent buy or sell in other auction process in which they are not participating. 
         [0057]    One example of a process for linking multiple auctions in accordance with the present invention is illustrated in  FIG. 7 . As shown, once process  700  has begun at step  702 , the process determines whether one or more orders are eligible for a linked auction at step  704 . For example, one or more block orders may be allowed to be traded in linked auctions. If an order is not eligible, the order is made part of a main auction process at step  706  and then process  700  terminates at step  716 . Otherwise, a linked auction is initiated at step  708 . Next, process  700  determines at step  710  a factor in the linked auction to be controlled by the main auction process. For example the main auction process may control price, size, or time of transactions in the linked auction process. This factor control is then applied to the linked auction process at step  712 . Finally, the linked auction process completes at step  714  and then process  700  terminates at step  716 . 
         [0058]    Although the invention has been described in detail for the purpose of illustration, it should be understood that such detail is solely for that purpose and that variations can be made therein by those skilled in the art without departing from the spirit and scope of the invention except as it may be limited by the claims which follow.