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26. The following appeared in a memorandum from a member of a financial management and consulting firm. We have learned from an employee of Windfall, Ltd., that its accounting department, by checking about ten percent of the last months purchasing invoices for errors and inconsistencies, saved the company some $10,000 in overpayments. In order to help our clients increase their net gains, we should advice each of them to institute a policy of checking all purchasing invoices for errors. Such a recommendation could also help us get the Windfall account by demonstrating to Windfall the rigorousness of our methods. Sample Essay 1: The argument that checking all purchasing invoices for errors will not only increase the net gains of the clients but also help the firm get the Windfall account is not entirely logically convincing, since it ignores certain crucial assumptions. First, the argument assumes that instituting a policy of checking all purchasing invoices can help find out the errors and inconsistencies. There are a number of reasons why this might not be true. For example, the people who check the accounts will probably make mistakes as anyone else, intentionally or unconsciously. If they do, | 
