The period whose value shares serve as weights for a set of price relatives or elementary price indices. It does not have to have the same duration as the periods for which the index is calculated and in the case of a PPI is typically longer, a year or more, rather than a month or quarter. Nor does it have to be a single period as in the case of symmetric indices such as the Marshall Edgeworth, the Walsh and the Törnqvist price indices.

The volume of buildings is the total volume included between the outer surface of the outer walls measured from the level of the lowest storey to the roof of the building.

Visitors (from abroad to the country) are persons who do not reside in the country of arrival and who are admitted for short stays for purposes of leisure, recreation, holidays; visits to friends or relatives; business or professional activities not remunerated from within the receiving country; health treatment; or religious pilgrimages. Visitors include excursionists, tourists and business travelers.

The persons referred to in the definition of tourism are termed “visitors”: “Any person travelling to a place other than that of his/her usual environment for less than 12 months and whose main purpose of trip is other than the exercise of an activity remunerated from within the place visited” (Recommendations on Tourism Statistics, Part One, para. 20)

See Visitor consumption.

Visitor consumption is the basic concept measuring tourism activity and refers to total consumption of or on behalf of visitors and could, consequently, also be termed as "visitor demand".

A partnership among several enterprises sharing complementary expertise created expressly to produce a product with a short perspective life span with the production of the product being controlled through a computerized network. The corporation is disbanded with the conclusion of the product’s life span.

The value of work put in place is the value of work carried out on projects completed during the inquiry period, plus the value of work under construction at the end of the inquiry period minus the value at the beginning of the period. It includes construction work done as a main contractor and on own-account, plus work done as a subcontractor (minus the payments to sub- contractors for work done).

The usual environment required to distinguish a visitor from all other travelers within a location is difficult to define in precise terms. Generally speaking, it corresponds to the geographical boundaries within which an individual displaces himself/herself within his/her regular routine of life. As stated in the Recommendations on Tourism Statistics, the usual environment of a person consists of the direct vicinity of his/her home and place of work or study and other places frequently visited.

Unpaid family members (working in an establishment) include all persons living in the household(s) of the proprietor(s) of the owning enterprise and working in or for the establishment without regular pay for at least one third of the normal working hours of the establishment. Individual countries may find it necessary to either restrict or extend this definition to take account of their own culture and economy.