Ibbotson doesn't think this one will be quickly arbitraged away, however, because of the unassailable barrier to big trades.
But look what happened: Microsoft did continue to grow, but at a much slower rate, and its once-unassailable monopolies began to come under attack.
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Mauresmo eased past Shaughnessy 6-2 6-1 to give France an unassailable lead in Moscow and they went on to wrap up a 4-1 victory.
In the Shropshire Premier League , Oswestry clinched the title, winning by 25 runs at Broseley - to give Mark Robinson's men an unassailable lead with two games still to go.
The West Indies have arrested their slump in form to take an unassailable 3-1 lead in the best-of-five series.
In the fashion industry, notoriously marked with changing tastes and short lived brand appeal, Polo seems to have an unassailable competitive position.
Despite such doubts about the change, the replacement of Se Yung, 70, with his nephew, Chung Mong Koo, 60, may yet prove to be an unassailable success.
Michael Llodra and Julien Benneteau beat Fernando Verdasco and Feliciano Lopez 6-1 6-2 6-7 (6-8) 7-6 (7-5) to give France an unassailable 3-0 lead.
David Ferrer beat Stanislas Wawrinka 6-2 6-4 6-0 to give Spain an unassailable lead in the World Group tie after they had led 2-1 overnight.
BBC: David Ferrer secures Spain Davis Cup quarter-final spot
And Amas Roberts's try seemed to have given Wigan an unassailable 18-0 lead.
Teenage star Melanie Oudin continued her heroics with a second singles victory as she beat Julie Coin 7-6 6-4 to give her side an unassailable 3-0 lead.
After his 6-3 6-4 win over Seppi, Ivanovic polished off Francesca Schiavone 6-0 6-4 to make sure Serbia made a winning start to their campaign with an unassailable 2-0 lead.
It might be that Groupon will successfully follow the Amazon model and wisely invest to build a dominant, almost unassailable operating model.
When that happens, it will help China Mobile promote 3G better and gradually transition its huge 2G base to 3G, eventually taking an unassailable lead over its rivals.
The win meant Australia kept their unbeaten record against Pakistan going back to 1995, and also took an unassailable 2-0 lead in the best-of-three series.
That was an unassailable lead going into the final period and Coventry stretched it out to 7-2 before Ukrainian Pavel Gomenyuk wrapped up the scoring 21 seconds from time for Strachan's out-gunned side.
Australia recovered from a disappointing Ashes to draw the Twenty20 series against England before taking an unassailable 4-1 lead in the teams' one-day meetings with a 51-run win in Brisbane on Sunday.
When he returned to the cabinet as its second-ranking member his position looked unassailable.
England were all set to romp home at 185-3, needing 213 for an unassailable 3-0 lead in the five-match series.
Manchester United, owned by the American Glazer family, look set to win a record 20th league title this season, holding an unassailable 15-point lead over their fierce rivals Manchester City.
CNN: Manchester United pen new multi-million dollar Aon deal
Debt relief for Africa and the unassailable growth of the internet were supposed-good news stories that Panorama was able to investigate with customary vigour.
But unfortunately, what looked like an unassailable market position in 1984 diminished dramatically as not only homeowners but corporations started shifting to new offerings from competitors.
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Added to those of its traditional European allies, the votes give its candidate an unassailable advantage.
England slumped to defeat in their one-day series with India as the hosts took an unassailable 4-0 lead on Sunday.
It will then use that advantage to build share, improve products, streamline processes, cut costs and achieve virtually unassailable advantage.
As the late, great economist Julian Simon demonstrated (both with clear economic logic and an unassailable mountain of data), there is a long-run tendency for standards of living to improve and for material scarcity to relax as a constraint rather than tighten.
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