highway robbery vs reasonable

highway robbery

noun
  • The act of robbing a traveler on a public road. 

  • Said of excessive or exorbitant prices. 

reasonable

adj
  • Just; fair; agreeable to reason. 

  • Satisfactory. 

  • Not excessive or immoderate; within due limits; proper. 

  • Not expensive; fairly priced. 

How often have the words highway robbery and reasonable occurred in a corpus of books? (source: Google Ngram Viewer )