A change in price causes both Surplus and Shortages. Surplus means in excess (having too much). For example, if a store which sold an item for 10 dollars decided to change the price to 12 dollars,...
Consumer surplus - the difference between what a consumer is willing to pay and what they actually pay. Aggregate consumer surplus measures consumer welfare.
Producer surplus - the difference...
A shortage is when there is a LACK (not enough) of that particular resource/product/item. A surplus is when there is EXCESS, or too much of a resource/product/item.