body: Paul Davies. [*JC Smith's The Law of Contract* (2018 2 ed)](https://www.amazon.co.uk/Smiths-Law-Contract-Paul-Davies/dp/0198807813/ref=dp_ob_title_bk). pp. 425-426.
  
  
  1. This question's title refers to the red underlines beneath.
  2. What exactly is this 'legitimate interest protected' by exorbitant credit card interest rates?
  
  
  
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title: How does the 'legitimate interest protected' by exorbitant credit card interest differ from that of exorbitant interest 'on outstanding fees'?