All other things unchanged. An impossible situation. But this is used to study the relationship between two variables-- to keep it simple, this condition is required. Truly, though, in life, things are not simple in this way, cut and dry. There are infinite other factors involved. But when only the two matter, all other things remain unchanged. We need this impossible situation. -- __________________________________________________________ Sign-up for your own personalized E-mail at Mail.com http://www.mail.com/?sr=signup
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