Assertion: ballpoint pen's pen | /r/HasProperty | popular
Facets:
value: particularly
type: DEGREE
value: due to reasonable prices
type: CAUSE
value: due to their availability
type: CAUSE
value: tremendously
type: DEGREE
Source sentences:
text: Erasable pens were tremendously popular when they were introduced in the early 1980s.
text: Ballpoint and rollerball pens are popular writing tools due to their availability and reasonable prices.
text: The pens are also a popular advertising medium and considered a "premium" promotion.
text: These pens are particularly popular because they are easy to write with.