- The Federal Reserve’s Fedwire funds transfer service—the biggest large-value payments system in the United States—has long displayed a concentrated peak of activity in the late afternoon.
 
                 
                 
                - Theory suggests that the concentration of late-afternoon Fedwire activity reflects coordination among participating banks to reduce liquidity costs, delay costs, and credit risk; as these costs and risk change over time, payment timing most likely will be affected.
 
                 
                 
                - The sending of large payments late in the day can heighten operational risk by increasing the potential magnitude of liquidity dislocation and risk if operational disruptions were to occur.
 
                 
                 
                - Armantier, Arnold, and McAndrews quantify how the changing environment in which Fedwire operates has affected the timing of payment value transferred within the system between 1998 and 2006.
 
                 
                 
                - The study finds that the peak of the timing distribution has become more concentrated, has shifted to later in the day, and has divided into two peaks.
 
                 
                 
                - The authors attribute the changes in payment timing in Fedwire to several factors:
 
                 
                
                    - changes in Federal Reserve System policies that govern the provision of daylight overdrafts,
 
                     
                     
                    - variations in the value and volume of payments, and 
 
                     
                     
                    - changes in the flow of payments from private sector settlement institutions.
 
                     
                     
                 
                 
                - The study’s results provide no specific evidence of heightened operational risk attributable to activity occurring later in the day; however, they point to a high level of interaction between Fedwire and private settlement institutions. 
 
                 
                 
             
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