A backlog is the aggregate sale value of all received customer orders that have not yet been shipped. A backlog is present when the production capacity of a business is less than the rate at which orders are being received. The trend line of the backlog can be monitored to see if it changes over time. An increasing backlog indicates a substantial order book that will eventually translate into future sales, or a decline in production capacity. A declining backlog indicates that there will eventually be a drop in sales, or that the production capacity of the business has increased. In the area of trendy consumer goods, the seller might attempt to artificially maintain a small backlog, which gives the impression that a high level of demand exists for the product.