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concentration risk
Concentration risk is a banking term denoting the overall spread of a bank's outstanding accounts over the number or variety of debtors to whom the bank has lent money. This risk is calculated using a "concentration ratio" which explains what percentage of the outstanding accounts each bank loan represents. For example, if a bank has 5 outstanding loans of equal value each loan would have a concentration ratio of .2; if it had 3, it would be .333.
Various other factors enter into this equation in real world applications, where loans are not evenly distributed or are heavily concentrated in certain economic sectors. A bank with 10 loans, valued at 10 dollars a piece would have a concentration ratio of .10; but if 9 of the loans were for 1 dollar, and the last was for 50, the concentration risk would be considerably higher. Also, loans weighted towards a specific economic sector would create a higher ratio than a set of evenly distributed loans because the evenly spread loans would serve to offset the risk of economic downturn and default in any one specific industry damaging the bank's outstanding accounts.
Risk of default is an important factor in concentration risk. The basic issue raised by the concept of default risk is: does the risk of default on a bank's outstanding loans match the overall risk posed by the entire economy or are the bank's loans concentrated in areas of higher or lower than average risk based on their volume, type, amount, and industry.
==Types of Concentration Risk==
There are two types of concentration risk. These types are based on the sources of the risk. Concentration risk can arise from uneven distribution of exposures (or loan) to its borrowers. Such a risk is called Name Concentration risk. Another type is Sectoral Concentration risk which can arise from uneven distribution of exposures to particular sectors, regions, industries or products.〔http://www.visibleequity.com/creditrisksoftware/Learn/concentration-risk-methodology.jsp〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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