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so that loans are profitable to them. To acplish effective screening, lenders must collect reliable information from prospective borrowers. Effective screening and information collection together form an important principle of credit risk management. 2 Specialization in lending. One puzzling feature of bank lending is that a bank often specializes in lending to local firms or to firms in particular industries, such as energy. In one sense, this behavior seems surprising because it means that the bank is not diversifying its portfolio of loans and thus is exposing itself to more risk. But from another perspective such specialization makes perfect sense. The adverse selection problem requires that the bank screen out bad credit risks. It is easier for the bank to collect information about local firms and determine their creditworthiness than to collect parable information on firms that re far away. Similarly, by concentrating its lending on firms in specific industries, the bank bees more knowledgeable about these industries and is therefore better able to predict which firms will be able to make timely payments on their debt. Monitoring and Enforcement of Restrictive Covenants. Once a loan has been made, the borrower has an incentive to engage in risky activities that make it less likely that the loan will be paid off. To reduce this moral hazard, financial institutions must adhere to the principle for managing credit risk that a lender should write provisions (restrictive covenants) into loan contracts that restrict borrowers from engaging in risky activities. By monitoring borrowers’ activities to see whether they are plying with the restrictive covenants and by enforcing the covenants if they are not, lenders can make sure that borrowers are not taking risks at their expense. The need for banks and other financial institutions to engage in screening and monitoring explains why they spend so much money on auditing and informationcollecting activities. Longterm customer relationships An additional way for banks and other financial institutions to obtain information about their borrowers is through longterm customer relationships, another important principle of credit risk management. If a prospective borrower has had a checking or savings account or other loans with a band over a long period of time, a loan officer can look at past activity on the accounts and learn quite a bit about the borrower. The balances in the checking and savings accounts tell the banker how liquid the potential borrower is and at what time of year the borrower has a strong need for cash. A review of the checks the borrower has written reveals the borrower’s suppliers. If the borrower has