Contact - breach of contract - action for inducement of breach of contract - appellant company having a monopoly in cement manufacture - respondent a transport company contractually engaged by various parties to collect cement from the appellant's plant and to deliver it - appellant preventing the respondent's transportation vehicles from entering its plant on account of a debt that the respondent allegedly owed to the appellant's subsidiary company - whether the appellant's act amounted to an inducement to breach the contract between the respondent and its customers - whether the respondent was entitled to damages - duty of a claimant to prove special damages - there is no discretion for a trial judge when assessing special damages - whether the respondent had failed to prove the damages - whether the entitled could only obtain nominal damages.