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Persistent disparities among the leading industrial economies are putting further strains on an increasingly interdependent world economy . And also these view rules made problems because the rule system was n't able to apply them properly on other statements than a SELECT ( for example an UPDATE that used data from a view did n't work ) . We saw a recurrence of this phenomenon just last year , when the United States economic slowdown was the central reason for the sharpest contraction in trade performance worldwide since 1982 . In fact , logical equality is not good enough either ; the operator had better represent pure bitwise equality , because the hash function will be computed on the memory representation of the values regardless of what the bits mean .