A public utility is defined as a commodity or service such as electricity, gas, water, sewer and trash. "Utility" is an economic term introduced by Daniel Bernoulli referring to the total satisfaction received from consuming a good or service. The economic utility of a good or service is important to understand because it will directly influence the demand, and therefore price, of that good or service. Utility is a term used by economists to describe the measurement of "useful-ness" that a consumer obtains from any good. Utility may measure how much one enjoys a movie, or the sense of security one gets from buying a deadbolt. The utility of any object or circumstance can be considered. Energy managers coordinate energy supplies and services for a variety of businesses and organizations. A utility manager, also known as a public works director, oversees the operations and maintenance of the systems responsible for water treatment, wastewater collection, and water distribution to a localized community.