Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In economics, a demand shock is a sudden event that increases or decreases demand for goods or services temporarily. A positive demand shock increases demand and a negative demand shock decreases demand. Prices of goods and services are affected in both cases. When demand for a good or service increases, its price typically increases because of a shift in the demand curve to the right. When demand decreases, its price typically decreases because of a shift in the demand curve to the left.