free trade vs liberalism

free trade

noun
  • International trade without government interference, especially from tariffs or duties on imports. 

liberalism

noun
  • The quality of being liberal. 

  • Any political movement founded on the autonomy and personal freedom of the individual, progress and reform, and government by law with the consent of the governed. 

  • An economic ideology in favour of laissez faire and the free market (related to economic liberalism). 

How often have the words free trade and liberalism occurred in a corpus of books? (source: Google Ngram Viewer )