Planning fallacy
The Sydney Opera House was expected to be completed in 1963. A scaled-down version opened in 1973, a decade later. The original cost was estimated at $7 million, but its delayed completion led to a cost of $102 million.
Opera Australia
Opera Australia is the principal opera company in Australia. Based in Sydney, its performance season at the Sydney Opera House accompanied by the Australian Opera and Ballet Orchestra runs for approximately eight months of the year, with the remainder of its time spent in the Arts Centre Melbourne, where it is accompanied by Orchestra Victoria. In 2004, the company gave 226 performances in its subscription seasons in Sydney and Melbourne, attended by more than 294,000 people.