ABSTRACT
Intangible effects: are those that cannot as easily be valued in monetary terms. This includes nature conservation, tourism, or stimulation of business climate and increased trade area for a harbour or city. Other benefits might be increased security, recreational opportunities and aesthetic appeal. These effects are difficult to measure, but the effects may easily be larger and last longer than the direct economic outcome of the project. Improving inland shipping capacity by dredging channels can reduce road traffic problems by reducing the amount of heavy traffic and thus costly wear on roads. These kinds of interactions may influence the entire economy of a region, a state or a country.
