downmarket vs low-grade

downmarket

adj
  • Of, or relating to the less prestigious sector of the market. 

  • Designed for low-income consumers. 

verb
  • To make or become downmarket. 

adv
  • Towards the less prestigious sector of the market. 

low-grade

adj
  • Of inferior quality. 

How often have the words downmarket and low-grade occurred in a corpus of books? (source: Google Ngram Viewer )