Abstract:
A method for tracking credit limits between a first financial institution and a second financial institution is disclosed. Each financial instrument may have one or more tenors. An initial credit limit is assigned to a credited financial institution for each tenor of each financial instrument to be traded. A relationship is assigned to each credit limits on a first plurality of tenors wherein credit extended on one of said tenors reduces the available credit on said other tenors, said credit being reduced in proportion to said preassigned proportions. When the system receives a signal associated with trades between counterparties, the system updates the credit limits between the counterparties in accordance with preassigned proportions.

Description:
FIELD OF THE INVENTION 
   This invention generally relates to computerized brokerage systems and more particularly, to the electronic trading of financial instruments between various counterparties having unilateral or bilateral credit relationships. 
   BACKGROUND 
   When financial instruments, such as those listed in Table 1, are traded, the credit worthiness of the opposing counterparty is important because obligations of one or both parties under such financial instruments may extend up to and beyond thirty years. Each of the parties may be exposed to risk based upon the ability of a counterparty to fulfill its obligations. The resulting credit exposure over the life of a contract is potentially an unknown amount. Therefore, trading parties have a significant interest in limiting credit exposure. 
   In a typical “conversational” trading desk scenario in which traders enter and act on orders over the telephone, a credit officer for each trading entity assigns credit lines for each potential counterparty. An intermediary broker is used to match bids and offers between various parties. Once two parties are matched, credit officers for both parties then determine whether to approve the transaction based on the opposing party&#39;s credit limit. Alternatively, the broker may maintain a list of which entities each party is willing to trade with, and only match parties who are cleared to deal with one another. 
   
     
       
             
           
             
             
           
             
             
           
             
             
           
             
             
           
             
             
           
             
             
           
             
           
             
             
           
             
             
           
             
             
           
             
             
           
             
             
           
             
             
           
             
             
           
             
             
           
             
           
             
             
           
             
             
           
         
             
               TABLE 1 
             
             
                 
             
           
           
             
               F/X Products 
             
           
        
         
             
                 
               American and European Options 
             
           
        
         
             
                 
               Calls 
             
             
                 
               Puts 
             
             
                 
               Risk Reversals and Straddles 
             
             
                 
               Strangles 
             
           
        
         
             
                 
               Exotic Options 
             
           
        
         
             
                 
               Knock-ins/outs 
             
             
                 
               Reverse knock ins/outs 
             
           
        
         
             
                 
               Other Instruments 
             
           
        
         
             
                 
               Forwards 
             
           
        
         
             
               Fixed Incom Products 
             
           
        
         
             
                 
               Swaps 
             
           
        
         
             
                 
               Swap spreads (traded with treasury hedge) 
             
             
                 
               All-in rate swaps 
             
             
                 
               Spread switches 
             
             
                 
               All-in-rate switches 
             
             
                 
               1–3,3–6,1–6 month LIBOR basis swaps 
             
             
                 
               CP-3 month LIBOR basis swaps 
             
           
        
         
             
                 
               Forward Rate Agreements 
             
           
        
         
             
                 
               1/3/6 month LIBOR 
             
             
                 
               FRA Switches 
             
           
        
         
             
                 
               Swaptions 
             
           
        
         
             
                 
               European (payer, receiver, straddle) 
             
             
                 
               Bermudan (payer, receiver, straddle) 
             
             
                 
               Bermudan-European Switches (payer, receiver, straddle) 
             
             
                 
               LIBOR Cap/Floor, Straddle 
             
             
                 
               LIBOR Digital Cap/Floor 
             
           
        
         
             
                 
               Convexity Products 
             
           
        
         
             
                 
               Cap/Floor, Straddle (CMS/CMT 2, 5, 10, 30 year tenors) 
             
             
                 
               Rolling Spread Locks against a spot hedge 
             
             
                 
               Rolling Spread Locks quoted outright 
             
           
        
         
             
               Equity Index Products 
             
           
        
         
             
                 
               American and European Options 
             
           
        
         
             
                 
               Calls 
             
             
                 
               Puts 
             
             
                 
               Straddles 
             
             
                 
                 
             
           
        
       
     
   
   A number of systems have been developed which attempt to automate the trading process and provide credit controls. For example, U.S. Pat. No. 6,014,627 describes an anonymous trading system which identifies the best bids and offers from those counterparties with which each party is eligible to trade. The system pre-screens each bid and offer for a particular type of financial instrument for compatibility with credit information to calculate a best price (the “dealable” price), for each entity dealing with the particular financial instrument. 
   U.S. Pat. No. 5,924,083 describes a distributed trading system for displaying a credit-filtered view of markets for financial instruments based upon credit limits entered by the trading parties. Each trading entity initially enters credit information which consists of the amount of credit that the trading entity is willing to extend to other trading entities for one or more types of trading instruments. Each trading entity may also create group credit limits by which the trading entity may limit the amount of credit it is willing to extend to a group of potential counterparties. 
   PCT Application, No. PCT/US98/21518 describes a credit preference method in an anonymous trading system for screening trades between entities. Three screening methods are described: a binary method in which each entity makes a yes or no determination as to whether or not it will deal with each potential counterparty; a line binary or time limit method in which each entity sets a maximum maturity of contracts for each potential counterparty; and a “complex” method in which each entity specifies a maximum amount it will trade with each counterparty for one or more “maturity bands.” The system provides a “complex preference interface” through which a credit administrator for the trading entity can specify for each potential counterparty, the maximum exposure for each maturity band. For example, an entity could specify that for a given counterparty, it “will do up to $100 million out for 5 years, and then only $50 million out from thereafter out to 10 years, and nothing thereafter.” In determining appropriate limits, the administrator use a measure of “risk equivalence” (RQ) which is calculated as a function of the potential exposure averaged over a series of time points, weighed by a discount factor. 
   Although the above systems disclose credit mechanisms for use with trading systems, no known prior art allows an administrator or other authorized user to easily relate credit limits for multiple tenors or instruments. Thus, there exists a need for a method and system of facilitating the use of related credit limits for use with trading systems. 
   SUMMARY OF THE INVENTION 
   These and other limitation of the prior art are addressed in the present invention which is a system and method of tracking credit limits between counterparties trading financial instruments on a trading system, where each financial instrument may have one or more tenors associated with it. Each trading party has a set of credit limits associated with each other potential trading party. This includes a credit limit for one or more tenors of each financial instrument to be traded. The tenors are grouped into sets of “buckets,” where a single credit limit is applied to all tenors in an individual bucket. A relationship is associated with the credit limits for a first group of buckets wherein credit extended on one of the tenors in an individual bucket proportionally reduces the available credit for the other buckets, and therefore the credit limit on each tenor in the buckets. When a trade is entered into between a party and a given counterparty for a given tenor, the credit limit for the bucket associated with the tenor is reduced by the amount of the trade and the credit limits on the related buckets are proportionally reduced. In a preferred embodiment, the credit limit of each bucket is reduced in proportion to an initial assigned credit limit. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a schematic diagram of exemplary credit relationships formed between trading organizations in accordance with the present invention; 
       FIG. 2  is a flow chart of a preferred process for tracking credit limits in accordance with the invention; 
       FIG. 3  is a flow chart of a method for calculating proportional draw downs and currently available limits in accordance with the present invention; 
       FIG. 4  shows an exemplary user interface for selecting trading groups in accordance with the present invention; 
       FIGS. 5A and 5B  show an exemplary user interface for specifying draw down proportions for various tenors for financial instruments in accordance with the present invention; 
       FIG. 6  shows an exemplary user interface for setting eligibility as well as available credit multipliers for a plurality of counterparties in accordance with the present invention; 
       FIG. 7  shows an exemplary user interface for customizing proportional draw downs for individual institutions; 
       FIG. 8  shows an exemplary user interface for globally selecting buckets of financial instruments; 
       FIG. 9  shows an exemplary user interface for setting buckets for an individual institution; 
       FIG. 10  shows an exemplary trader screen including credit relationship status information for each bid and offer; and 
       FIG. 11  is a schematic of an exemplary computer network implementing the disclosed invention. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   With reference to  FIG. 1 , a typical trading and credit scenario is described. Trades of financial instruments are typically performed between trading groups ( 10 ,  12 ,  14 ,  16 ,  18 ,  20 ). Each trading group typically trades one or more types of financial instruments. Each trading group also typically includes one or more individual traders. Credit relationships are typically established between trading groups and legal organizations ( 22 ,  24 ,  26  and  28 ). Alternatively, credit relationships may be formed between trading groups and parent companies of the legal organizations (shown as institutions  30 ,  32 ); or between any combination of trading groups, organizations, institutions, or other entity. Accordingly, the term “party” or “counterparty” shall refer to any institution, organization, trading group, or other entity which has a unilateral or bilateral credit relationship with another entity. In a typical scenario, a credit officer or someone with policy setting power for a party will define the amount of credit the party is willing to extend to each potential counterparty. 
   The invention is most suited to instruments that include on-going obligations, such as those listed in Table 1, but can also be applied to other instruments, such as stocks and bonds where a party&#39;s only significant risk is settlement. Moreover, the invention also applies to contracts based upon the exchange of any commodity, such as contracts for the exchange of bandwidth, real estate, electricity, processing power, freight transportation, etc. Thus the term “financial instruments” as used herein includes contracts based upon such commodities or services. 
   With reference to  FIG. 2 , an overview of the system for entering and processing credit limits on buckets is described. For each potential counterparty ( 50 ), the system is initialized, i.e. α is set to zero ( 51 ), and the credit officer or other authorized user (referred to herein as an “administrator” or “credit officer”) defines a Proportional Draw Down limit ( 52 ) for each bucket by tenor M i   0  for buckets (i=1 . . . N). The administrator may combine several tenors or financial instruments into a single bucket. Thus, for example, the administrator may choose to set up three buckets for a given financial instrument, such as a two year tenor, a five year tenor and a seven year tenor. Any tenor for this financial instrument would then be assigned to one of these buckets based on its lifespan. In a preferred embodiment, any tenor of the financial instrument of two years or less would be assigned to the two year bucket; any tenor of the financial instrument of greater than two years but less than or equal to five years would be assigned to the five year bucket; and any tenor of the financial instrument of greater than five years but less than or equal to seven years would be assigned to the seven year bucket. Any tenor of the financial instrument of greater than seven years could not be traded unless the administrator chose to create an additional bucket of a longer tenor. In an alternate embodiment, tenors of greater than the maximum bucket tenor are given a “maybe” trading status, as described further below. The administrator further decides how buckets are related. For example, all tenors of a given financial instrument are typically related. In addition, the administrator may also decide to group different financial instruments, such as swaps and options, together, such that credit drawn down for swaps will reduce the credit available for the options. 
   The Proportional Draw Down for each bucket represents the amount of trading that could potentially be done (on a notional basis) in a single bucket that would completely exhaust the entire credit limit of a given counterparty. Combined, the Proportional Draw Downs for a group of buckets give the proportional relationship between trades done in different buckets. In one embodiment of the invention, the administrator may further define an Overriding Credit Limit ( 54 ) for each bucket O i   0  for buckets (i=1 . . . N) which is an additional constraint on credit that further limits the trading in any bucket. The Overriding Credit Limit is the maximum that may be drawn down from a given bucket. The Current Available credit limit at any given time for each bucket is then the minimum of the Proportional Draw Down and the Overriding Credit Limit. In one embodiment, the administrator may further specify a minimum trade amount (CL min ) below which trades will be allowed. This may be a global variable or assigned individually for each entity. Optionally, this minimum is simply set to zero. 
   The Proportional Draw Downs create a relationship between the various buckets for the various instruments, such that the trading in any instrument in any single bucket will have an effect on all of the instruments in any related buckets. While the present invention is described in terms of Proportional Draw Downs, other methods of specifying the relationship between tenors of financial instruments are within the scope of the invention and will be apparent to those of skill in the art based on the specification herein. These alternate methods include, without limitation, specifying the fractional relationships between buckets. Thus, for example, one could specify a credit relationship between ten year, five year, and two year tenors, for a given option, as 1:4; 1:2; and 1:1. Once the administrator defines the Proportional Draw Downs, and, optionally, the Overriding Credit Limits, the system calculates ( 55 ) initial Currently Available Limits for each bucket C i   0  for buckets (i=1 . . . N). The initial Currently Available Limits are preferably calculated according to the formula:
 
 C   i   0 =max(min[ M   i   0   , O   i   0   ], CL   min ).
 
   As shown in  FIG. 2 , after the Proportional Draw Down Limits and Overriding Limits are defined, and the initial Currently Available Limits are calculated, the system is ready to process trades ( 56 ). A preferred methodology utilizing the concept of Proportional Draw Downs along with Overriding Limits to track Current Available Limits is now described:
         Suppose there are N Buckets: 1 . . . N.   Suppose that there have been α (α=0, 1, 2, . . . ) trades done so far.   Denote the values of the Proportional Draw Downs for the N buckets after α trades as M i   α , i=1 . . . N, the values of the Overriding Limits as O i   α , i=1 . . . N, and the values of the Current Available Limits as C i   α , i=1 . . . N.   Suppose that the α+1 trade is done ( 56 ) in the k th  bucket with size X k .       

   In one embodiment of the invention, both parties to a trade will draw down the credit limits available to the opposing party for any trade. In another embodiment, trades for certain types of instruments having non-symmetrical credit risks will only draw down against the credit limits for one of the parties. For example, the buyer of an option would want to reduce the credit limit of the party it is buying the option from, whereas the seller of an option may not want to reduce the credit limit of the party it is selling the option to. In this embodiment, the system will determine whether to reduce one or both parties respective credit limits based on the nature of the instrument and whether the party is a buyer or a seller. 
   The system calculates ( 58 ) (for at least one counterparty) new values for the Proportional Draw Downs as:
 
 M   i   α +1 =M   i   α −( M   i   α   /M   k   α )* X   k .  (1)
 
   The system calculates ( 60 ) (for at least one counterparty) new values for the Overriding Limits as:
 
 O   i   α+1   =O   i   α −δ ik   *X   k .  (2)
         where δ ik  is the well known Kronecker Delta and has a value equal to 0 if i is not equal to k and a value equal to 1 if i equals k.       

   The system calculates ( 62 ) (for at least one counterparty) new values for the Current Available Limits as:
 
 C   i   α+1 =max(min[ M   i   α+1   , O   i   α+1   ], CL   min ).  (3)
         where max is the maximum function which compares the two arguments and returns their maximum, and min is the minimum function which compares its two arguments and returns their minimum.       

   As noted above, in one embodiment CL min  is automatically set by the system to zero. This ensures that the counterparty&#39;s credit limit will never be less than zero. However, CL min  may be changed by an authorized user. Finally, α is incremented ( 63 ) 
   For the case of a typical trading desk authorized to trade swaps and options the following examples will help to understand the invention. Assume the trading desk&#39;s credit officer has specified the values for Proportional Draw Downs and Overriding Limits as shown in the first two rows of Table 2 and Table 3 below. 
   Initially no trades have taken place (i.e. α=0). 
   
     
       
             
             
             
             
           
             
             
             
             
           
         
             
               TABLE 2 
             
             
                 
             
             
                 
               2 Year 
               5 Year 
               10 Year 
             
             
               SWAPS 
               (“bucket 1”) 
               (“bucket 2”) 
               (“bucket 3”) 
             
             
                 
             
           
           
             
                 
             
           
        
         
             
               Proportional Draw Down 
               400 
               200 
               100 
             
             
               ($MM) 
             
             
               Overriding Limit ($MM) 
               300 
               100 
               80 
             
             
               Current Available Limit 
               300 
               100 
               80 
             
             
               ($MM) 
             
             
                 
             
           
        
       
     
   
   
     
       
             
             
             
             
           
             
             
             
             
           
         
             
               TABLE 3 
             
             
                 
             
             
                 
               2 Year 
               5 Year 
               10 Year 
             
             
               OPTIONS 
               (“bucket 4”) 
               (“bucket 5”) 
               (“bucket 6”) 
             
             
                 
             
           
           
             
                 
             
           
        
         
             
               Proportional Draw Down 
               800 
               400 
               200 
             
             
               ($MM) 
             
             
               Overriding Limit ($MM) 
               500 
               400 
               200 
             
             
               Current Available Limit 
               500 
               400 
               200 
             
             
               ($MM) 
             
             
                 
             
           
        
       
     
   
   If we let the two year bucket for Swaps be bucket 1; the five year bucket for Swaps be bucket 2; the 10 year bucket for Swaps be bucket 3; the two year bucket for Options be bucket 4; the five year bucket for Options be bucket 5; and the ten year bucket for Options be bucket 6; the values for Proportional Draw Downs, Overriding Limits, and Current Available Limits are as follows:
 
M 1   0 =400, M 2   0 =200, M 3   0 =100, M 4   0 =800, M 5   0 =400, M 4   0 =200;
 
O 1   0 =300, O 2   0 =100, O 3   0 =80, O 4   0 =500, O 5   0 =400, O 4   0 =200;
 
C 1   0 =300, C 2   0 =100, C 3   0 =80, C 4   0 =500, C 5   0 =400, C 4   0 =200.
 
   Now assume a trade takes place consisting of $40 MM of 2 year Swaps. The value for the trade size is:
 
X 1 =40.
 
   The new values (i.e. the α+1 values) for the Proportional Draw Downs, Overriding Limits, and Current Available Limits can then be calculated using equations (1), (2), and (3) respectively. 
   For example:
 
 M   1   1 =400−(400/400)*40=360;
 
 O   1   1 =300−1*40=260;
 
 C   1   1 =max(min(360,260),0)=260.
 
   Tables 2 and 3 can then be updated with the new values as shown in Tables 4 and 5, respectively. 
   
     
       
             
             
             
             
           
         
             
               TABLE 4 
             
             
                 
             
             
               SWAPS 
               2 Year 
               5 Year 
               10 Year 
             
             
                 
             
           
           
             
               Proportional Draw Down ($MM) 
               360 
               180 
               90 
             
             
               Overriding Limit ($MM) 
               260 
               100 
               80 
             
             
               Current Available Limit ($MM) 
               260 
               100 
               80 
             
             
                 
             
           
        
       
     
   
   
     
       
             
             
             
             
           
         
             
               TABLE 5 
             
             
                 
             
             
               OPTIONS 
               2 Year 
               5 Year 
               10 Year 
             
             
                 
             
           
           
             
               Proportional Draw Down ($MM) 
               720 
               360 
               180 
             
             
               Overriding Limit ($MM) 
               500 
               400 
               200 
             
             
               Current Available Limit ($MM) 
               500 
               360 
               180 
             
             
                 
             
           
        
       
     
   
   In a more general embodiment of the invention, Overriding Limits are not required. In essence, this is a special case of the above methodology in that it is equivalent to setting the Overriding Limit to the Proportional Draw Down for each bucket. The mathematical model for this case is as follows:
         Suppose there are N Buckets: 1 . . . N.   Suppose that there have been α(α=0, 1, 2, . . . ) trades done so far.   Denote the values of the Proportional Draw Downs for the N buckets as M i , i=1 . . . N.   Denote the values of the Current Available Limits after a trades as C i   α , i=1 . . . N.   Suppose that the α+1 trade is done in the k th  bucket with size X k .       

   The new values for the Current Available Limits are
 
 C   i   α+1 =max [ C   i   α −( M   i   /M   k )* X   k,   , CL   min ].  (4)
 
   Equation (4) can be employed in a similar manner to equation (3) above to continually track available credit. As above, in one embodiment CL min  is automatically set to zero, but may, alternatively, be administrated as noted above. 
   In one embodiment of the invention, the system implements the above procedure by normalizing the credit limits in buckets 1 . . . N to the credit limit for a single bucket, called a Normalized Total Credit (NTC). The buckets are typically normalized to the maximum tenor, for example, the swaps of Table 2 above would be normalized to $100 million ten year swaps. 
   Thus, for example the conversion ratios (CR i ) for the two, five, and ten year swaps of Table 2 could be expressed as: 0.25, 0.5, and 1, respectively, where NTC is the normalized total credit ($100 million) with respect to the ten year swap. 
   With reference to  FIG. 3 , a preferred method for calculating credit limits using NTC is now discussed. Once the Proportional Draw Downs and Overriding Credit Limits have been entered, the NTC must be set ( 70 ). As noted above, this is typically set equal to the Proportional Draw Down of the maximum tenor for at least one instrument, but may be set equal to any draw down limit or any arbitrary value. The conversion ratios (CR i ) are then calculated ( 72 ) for each bucket as the ratio of the NTC over credit limit for that bucket. When a signal indicating the α+1 trade has occurred for a tenor falling in the k th  bucket for amount X k , is being entered into is received ( 74 ), the system recalculates ( 76 ) the NTC as:
 
 NTC   α+1   =NTC   α −( X   k   *CR   i ).
 
   Proportional Draw Downs for each bucket (M i ) are calculated ( 78 ) as:
 
 M   i   α+1   =NTC   α+1 *1 /CR   i .
 
   Overriding Credit Limits (O i ) are calculated ( 80 ) as:
 
 O   i   α+1   =O   i   α−1   −δ   ik   *X   k .
 
   Current Available Limits (C i   α ) are calculated ( 82 ) as:
 
 C   i   α+1 =max (min[ M   i   α+1   , O   j   α+1   ], CL   min ).
 
   Continuing the example from Table 2 and 3 above, Tables 6 and 7 show initial Proportional Draw Downs of 400, 200, and 100 million, and Overriding Credit Limits of 300, 100, and 80 million for 2, 5 and 10 year swaps; and Proportional Draw Downs of 800, 400, and 200 million and Overriding Credit Limits of 500, 400, and 200 for 2, 5, and 10 year options, respectively. 
   
     
       
             
             
             
             
           
         
             
               TABLE 6 
             
             
                 
             
             
               SWAPS 
               2 Year 
               5 Year 
               10 Year 
             
             
                 
             
           
           
             
               Proportional Draw Down ($MM) 
               400 
               200 
               100 
             
             
               Conversion Ratio 
               CR:.25 
               CR:.5 
               CR:1 
             
             
               Overriding Limit ($MM) 
               300 
               100 
               80 
             
             
               Current Available Limit ($MM) 
               300 
               100 
               80 
             
             
                 
             
           
        
       
     
   
   
     
       
             
             
             
             
           
         
             
               TABLE 7 
             
             
                 
             
             
               OPTIONS 
               2 Year 
               5 Year 
               10 Year 
             
             
                 
             
           
           
             
               Proportional Draw Down ($MM) 
               800 
               400 
               200 
             
             
               Conversion Ratio 
               CR:.125 
               CR:.25 
               CR:.5 
             
             
               Overriding Credit Limit ($MM) 
               500 
               400 
               200 
             
             
               Current Available Limit ($MM) 
               500 
               400 
               200 
             
             
                 
             
           
        
       
     
   
   Assume forty million dollars of two year swaps, sixty-five million dollars of ten year swaps, as well as eighty million dollars of two year options are traded. NTC is calculated as follows:
 
 NTC =100−(40×0.25)−(65×1)−(80×0.125)=15.
 
   The new available limits, as shown in Tables 8 and 9 are calculated being 30 for the five year swaps or 2 times the ten year NTC, 60 for the two year swap or 4 times the ten year NTC, and the new values for the options are 2 times the ten year NTC or 30 for the ten year options, the five year options maximum is 60 or 4 times the ten year NTC, and the new two year options limit is 8 times the ten year NTC or 120. Had any of the overriding credit limits been less than the calculated available limits, those values would have been used. Also, tables 8 and 9 have been updated to reflect updated Overriding Credit Limits. 
   
     
       
             
             
             
             
           
             
             
             
             
           
         
             
               TABLE 8 
             
             
                 
             
             
               SWAPS 
               2 Year 
               5 Year 
               10 Year 
             
             
                 
             
           
           
             
                 
             
           
        
         
             
               Proportional Draw Down ($MM) 
               60 
               30 
               15 
             
             
               Overriding Credit Limit ($MM) 
               260 
               100 
               15 
             
             
               Current Available Limit ($MM) 
               60 
               30 
               15 
             
             
                 
             
           
        
       
     
   
   
     
       
             
             
             
             
           
             
             
             
             
           
         
             
               TABLE 9 
             
             
                 
             
             
               OPTIONS 
               2 Year 
               5 Year 
               10 Year 
             
             
                 
             
           
           
             
                 
             
           
        
         
             
               Proportional Draw Down ($MM) 
               120 
               60 
               30 
             
             
               Overriding Credit Limit ($MM) 
               420 
               400 
               200 
             
             
               Current Available Limit ($MM) 
               120 
               60 
               30 
             
             
                 
             
           
        
       
     
   
   With reference to  FIGS. 4–9 , a preferred interface for managing credit limits will now be described. The credit officer, administrator, or other authorized user selects from a list of trading groups (shown as  112 ,  114 ,  116 ,  118 ,  120 ,  122 ,  124  and  126 ). The credit officer will select one or more of these trading groups and set trading properties for the selected group or groups. The credit officer enters the properties screen by selecting the properties link ( 128 ). Overriding Credit Limits may be specified using a similar interface (not shown) for embodiments including overriding credit limits. 
     FIG. 5A  shows a draw down proportion screen (tab  150 ), including a draw down matrix ( 128 ), having three instruments, swaps ( 130 ), swaptions ( 132 ) and cap/floors ( 134 ). Additional instruments traded by the specific trading group, in this example, the USD Swaps and Options group, may be available by scrolling down the screen (not shown). In this example, four buckets for each instrument are displayed, two year ( 140 ), five year ( 142 ), seven year ( 144 ) and ten year ( 146 ). As noted above, each tenor for any listed instrument will be assigned by the system to one of the buckets for that instrument. The credit officer will enter the Proportional Draw Downs for each bucket for each instrument. For example, in  FIG. 5A , the officer has entered  1600  for two year swaps, 1000 for five year swaps, etc. As shown in  FIGS. 8 and 9 , the credit officer can redefine the number, and tenor, of buckets, either globally ( FIG. 8 ) or on an individual trading group ( FIG. 9 ) basis. 
   As shown by the horizontal and vertical “=” symbols in the draw down matrix ( 128 ), the Proportional Draw Downs for each tenor ( 140 ,  142 ,  144  and  146 ) of the instruments ( 130 ,  132  and  134 ) will be related. Thus, 500 in ten year swaps will be equivalent in draw down of credit to 1500 in two year cap/floors. As shown in  FIG. 5B , in one embodiment, the credit administrator may specify that certain instruments and/or tenors are not related, by turning off the horizontal and/or vertical “=” symbols. For example, in  FIG. 5B , the credit administrator has created two sets of buckets, one for USD swaps and USD swaptions, and a second for USD Cap/Floor. Thus, trading in the USD Cap/Floor instruments will not effect credit levels in the USD swaps and USD swaptions set of buckets. Likewise, trading in USD swaps or USD swaptions will not effect the credit levels in the USD Cap/Floor buckets. 
   Any instrument with a tenor not falling within a specific bucket will preferably be automatically grouped to the next higher bucket. Thus, for the example shown in  FIG. 5A , trading a six year swap will be the same as trading a seven year swap for credit purposes. In another embodiment, any instrument with a tenor not falling within a bucket will be allocated among the next higher and next lower buckets by mathematical interpolation. For the example shown in  FIG. 5A , a trade in a six year swap in this embodiment may have one half of its notational size drawn down from the five year bucket and one half drawn down to the seven year bucket. 
     FIG. 6  shows an eligibility screen (tab  152 ), including an eligibility matrix ( 160 ), having a list of eligible entities ( 162 ), a binary eligibility list ( 164 ) and a draw down multiple ( 166 ). A trading group profile specifies which entities will be included in the eligible institution list ( 162 ). The first time the credit officer accesses the eligibility screen (tab  152 ), eligibility is defaulted to yes for all entities in the eligible institution list and the multiplier ( 166 ) is defaulted to 1.0. Any entities not included in the list will be assumed to be eligible, although their multiplier will be set to zero. Thus, as described below, new institutions will be given “maybe” status until the administrator further specifies credit status for that institution. The credit officer may modify eligibility for any specific institution by clicking on the binary eligibility list ( 164 ). The draw down multiple list allows the credit officer to easily multiply the drawn down matrix ( 128 ) set above in  FIG. 5A  by a multiplication factor. For example, Morgan Guarantee Trust has been assigned a multiple of 2.0 in  FIG. 6 . The system would then multiply each entry in the draw down matrix ( 128 ) of  FIG. 5A  by a factor of 2.0. For example, the two, five, seven and ten year limits for USD Swaps for Morgan Guarantee Trust would be set to 3200, 2000, 1600 and 1000 for two, five, seven and ten year buckets, respectively. 
     FIG. 7  shows a customization screen (tab  154 ), including a customizable draw down matrix ( 170 ) and an available credit limit matrix ( 172 ) for each trading institution. The credit officer may individually set the draw down limits for each bucket and instrument for each trading institution. The screen allows the credit officer to scroll down to additional trading entities. Users without credit setting power may view this screen to see the available credit limits for each institution, but preferably, are not allowed to modify credit limits. 
   As shown in  FIG. 10 , credit relationships in accordance with the present invention may be displayed on trader screens such that the credit relationship for individual trades may be displayed while keeping the identity of the potential trading counterparty anonymous. In a preferred embodiment, individual bids and offers are displayed with an indication, preferably specific colors, corresponding to the potential credit relationship of the counterparty. Bids and offers on which credit is bilaterally approved according to the credit relationship scheme are indicated by a first color, preferably green (shown as standard font text in  FIG. 10 ). Bids and offers having a “maybe” status as to credit are indicated by a second color, preferably yellow (shown as underlined text in  FIG. 10 ). A bid or offer will have a “maybe” status when credit was initially assigned by either party to the potential counterparty but has been used up, at least for the specific tenor, through one or more trades. These are considered “maybe” in the preferred embodiment because credit officers typically spread credit over a variety of systems and are often willing to further extend credit on one or more systems to a specific counterparty, particularly when the credit for the given counterparty has been used up on one system but not another. Alternately, “maybe” status for a potential counterparty would arise where the initial proportional draw downs or overriding credit limits have been set to zero. Bids and offers in which one or both parties have a “no” status are indicated with a third color, preferably red (shown as bold/italic in  FIG. 10 ). This occurs when the credit officer for either party indicates they will not trade with the entity associated with the bid and/or offer. Traders using this system will immediately know the credit status, “yes,” “no,” or “maybe,” of any bid or offer on the system before attempting to enter into a trade. 
   The system is preferably implemented utilizing a computer network as disclosed in  FIG. 11 . Each trader station ( 250 ,  251  and  252 ) is connected to the server ( 254 ) through the network ( 255 ). The network ( 255 ) is preferably a private network connected through any number of means, such as T1 lines, digital subscriber lines, cable modems, satellite links, or other available connection means. One or more trader stations for a trade group may be coupled via a local area network ( 253 ). A credit officer station ( 256 ) also is preferably coupled via the same local area network ( 253 ) to server ( 254 ). Alternatively, trader stations ( 250 ,  251  and  252 ) may be coupled to server ( 254 ) through any of a number of means, such as via a public network such as the Internet or via a virtual private network. The system preferably utilizes a client-server architecture in which trader stations ( 250 ,  251  and  252 ) execute a thin-client written in Java to communicate with the server ( 254 ). In an alternate embodiment, the server ( 254 ) acts as a web server and communicates with trader stations ( 250 ,  251  and  252 ) using a page description language, such as HTML. In this embodiment, traders interact with server ( 254 ) using an HTML compatible browser (e.g., Netscape Navigator® or Microsoft Internet Explorer®). 
   Although the present invention was discussed in terms of certain preferred embodiments, the description is not limited to such embodiments. Rather, the invention includes other embodiments including those apparent to a person of ordinary skill in the art. Thus, the scope of the invention should not be limited by the preceding description but should be ascertained by reference to claims that follow.