highway robbery vs investment

highway robbery

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

  • Said of excessive or exorbitant prices. 

investment

noun
  • The act of surrounding, blocking up, or besieging by an armed force, or the state of being so surrounded. 

  • The act of investing, or state of being invested. 

  • A placement of capital in expectation of deriving income or profit from its use or appreciation. 

  • A mixture of silica sand and plaster which, by surrounding a wax pattern, creates a negative mold of the form used for casting, among other metals, bronze. 

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