POSNER, Circuit Judge.
This is a diversity suit for breach of contract, brought by Union Carbide against Oscar Mayer and resolved in the defendant's favor on summary judgment. Union Carbide sold Oscar Mayer plastic casings that Oscar Mayer uses in manufacturing sausages. The prices in Union Carbide's invoices to Oscar Mayer included two 1 percent sales taxes that are applicable to sales which originate in Chicago. Another supplier of plastic sausage casings to Oscar...
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