“…This 'instrumentalization of marriage' (Salles 2006) can lead to distinct marriage booms and busts that occur in reaction to the actual or expected changes in public pensions, taxation, or marriage allowances. Such distinct marriage booms took place in Sweden in 1989 ( Figure 1, see Sweden chapter and Andersson 1998), and in Austria in 1972, 1983, and 1987(Austria chapter, Prioux 1993 In addition, short-term marriage booms may also be caused by such factors as 'lucky' dates in the calendar, like, for example, July 7, 2007 (07-07-07).…”