The coefficient of the Readability is negative and statistically
significant for digital cameras suggesting that reviews that
have higher Readability scores are associated with higher sales.
This is likely to happen if such reviews are written in more
authoritative and sophisticated language which enhances the
credibility and informativeness of such reviews. Our results
are robust to the use of other Readability metrics described
in Table 1 such as ARI, Coleman–Liau index, Flesch–Reading
Ease, Flesch–Kincaid Grade Level and the SMOG index.