belt-tightening vs prudence

belt-tightening

noun
  • A reduction in expenditure, often as a result of financial restrictions. 

adj
  • Causing or involving a reduction in expenditure. 

prudence

noun
  • economy; frugality. 

  • The quality or state of being prudent 

How often have the words belt-tightening and prudence occurred in a corpus of books? (source: Google Ngram Viewer )