22:32World Business ReportFirst broadcast 2015/11/23 22:32 GMT: Pfizer Seals $160bn Allergan TakeoverBBC World Service Duration: 27 minutes Mon 23rd Nov 2015, 22:32 on BBC World ServiceAvailable for over a yearListen nowBut should Pfizer be allowed to slash billions of dollars from its tax bill? Show more GenresFactualMoneyFormatsBulletinsBrandWorld Business Report Source: BBC Online