downmarket vs substandard

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. 

substandard

adj
  • Of inferior quality; not meeting the minimum quality requirements. 

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