The vulnerability of the banking system should be obvious, although very few people recognize it. They do not understand the fractional reserve process: a massive inverted pyramid of debt -- promises to pay.
This is from the Web site of the Board of Governors of the Federal Reserve System.
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Almost all elements of banking today depend on the computer
Banks were among the first institutions to embrace the use of computers both to record accounts and to make transactions. Today, by one estimate, 90 percent of all bank assets are electronic entries in data bases and virtually all bank transactions involve electronic processing.