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Pfizer and Allergan announced plans to merge - arranged so that they'll pay taxes in Ireland rather than the United States, where rates are higher. It looks like another case of big firms side-stepping taxes the public would like them to pay. But the Â鶹Éç's business editor Kamal Ahmed says drug companies have to pay more attention to public opinion than many others. Photo: Two of Pfizer and Allergan's best-known drugs Credit: Reuters