at a premium vs unpopular

at a premium

prep
  • At a high, or higher than expected, price. 

  • Scarce, in short supply. 

  • Above par value. 

unpopular

adj
  • Not liked or popular; disliked or ignored by the public. 

  • Lacking popularity. 

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