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We show that the frequency of word use is not only determined by the wordlength \cite{Zipf1935} and the average information content\cite{Piantadosi2011}, but also by its emotional content. We have analyzedthree established lexica of affective word usage in English, German, andSpanish, to verify that these lexica have a neutral, unbiased, emotionalcontent. Taking into account the frequency of word usage, we find that wordswith a positive emotional content are more frequently used. This lends supportto Pollyanna hypothesis \cite{Boucher1969} that there should be a positive biasin human expression. We also find that negative words contain more informationthan positive words, as the informativeness of a word increases uniformly withits valence decrease. Our findings support earlier conjectures about (i) therelation between word frequency and information content, and (ii) the impact ofpositive emotions on communication and social links.

Positive words carry less information than negative words