Stephen Sondheim and George Furth's musical charts the turbulent relationship between three friends over three decades, starting in 1980 and travelling backwards in time.
Tipping is quite common according to the data, says Stephen Christophe, associate professor of finance at George Mason, who is to present his findings at the Financial Management Association's European conference in Prague on Thursday.
Warren Gatland will hope Rees is available for the Six Nations as the Wales coach will already be without wings Shane Williams and George North for the start of the campaign while Lee Byrne and Stephen Jones both face a race against time to be fit.
Stephen Craigan and Steven Davis have been ruled out by groin injuries, Kyle Lafferty has a foot injury and George McCartney is out with an ankle problem.