barter vs feedstock

barter

noun
  • The goods or services used in such an exchange. 

  • An exchange of goods or services without the use of money. 

verb
  • To exchange goods or services without involving money. 

feedstock

noun
  • Any bulk raw material constituting the principal input for an industrial process. 

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