They may have plateaued in their careers and are bored with the redundancy of their jobs.
In the late 1980s, lung cancers in women in their 60s plateaued, and even started to fall.
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Linden Lab, which set up the Second Life site two years ago, plateaued at 1, 000 users in August 2003.
It now has close to 37 million monthly active users, but its user growth has almost plateaued in the last week.
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Other data point in a similar direction: rich economies spend more than ever on research, but the number of new patents has plateaued.
The progress in graphics over the last 15 years has plateaued.
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Despite this, the progress of women in business has plateaued.
Prize pools and stream viewership have either plateaued or dropped.
While it is true that temperatures plateaued from 1998 to 2008, that fact, taken out of the broader context of climate, leads to all sorts of false assumptions.
Emerging market and investment grade bonds have sold off in the last few days, and the dollar high-yield index has plateaued, but European high-yield has remained on course, edging higher.
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It is interesting to note that the annual figure was growing at a rate of around 60% in the years (2007-8) leading up to the global financial crisis, but since then has more or less plateaued.
For this pattern to emerge, the Robber Baron era of our current technology cycle has to have matured and plateaued, and big companies must be in the market for incremental innovations that enhance their main offerings.
With the smartphone market in the developed regions getting more saturated (U.S. smartphone sales grew y-o-y by just 9% in Q2 2012) amid concerns that iPhone innovation has plateaued, Apple needs emerging markets such as China to drive iPhone growth in the coming years.
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The situation is a huge victory for Republican proponents of Right to Work laws, who argue they make states more competitive, and shines a spotlight on the dilemma faced by the labor movement, whose membership has plateaued due to the recession, the failure of organizing drives, and anti-union moves by political foes and companies alike.
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