On 12th May 1983, the High Court of Australia delivered an historic judgement in the case of Commercial Bank of Australia Ltd v Amadio and another (1983) 46 ALR 402 It has been said that this decision "changed the very fabric of how contracts are negotiated in Australia". Discuss this statement by way of providing a study of the case, examining the salient features of the case and the decision's effect on the prevailing business law of Australia.