These have both positive and negative aspects. It uses both positive and negative feedback. Hindsight bias has both positive and negative consequences. It contained both positive and negative comments. There are negative, positive and neutral responses reported. It involves a training set with both positive and negative values. This has both positive and negative features. Externalities can be either positive or negative. Inflation affects economies in various positive and negative ways. It received a mix of positive and very negative reviews. It can be zero, positive, or negative . Ionic bonding leads to separate positive and negative ions. Valence IATs measure associations between concepts and positive or negative valence. Some critics reject the distinction between positive and negative rights. Symptoms are described in terms of positive, negative, and cognitive symptoms.