That is partly because they often work in different fields, and many of them are part-timers with lower hourly rates.
They often work entirely alone, with little or no safety training.
For one thing, they often work in the financial services industry.
Each participant was asked to describe his or her work and home life: how often they were contacted at home by their job, whether that contact caused a conflict with their family responsibilities, and how often they were given more work than they could finish in an eight-hour day.
Recovering debt can be enormously expensive, so they are often willing to work out an agreement with you.
Workers who have control over where, when and how they work are often perceived as less productive.
Vasil says they often performed glorified secretarial work, including reviewing electronic documents to identify their author and destination.
Just as hospitals and doctors are often willing to negotiate on prices, they're also often willing to work out interest-free monthly payments.
Surveys show that some 50% to 80% of us dream about work, with a significant portion admitting they often wake up in a cold sweat and experience work nightmares once or more a week.
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They work hard and often create brilliant products.
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Since these hires lack significant work experience they are often affordable hires for a limited salary budget.
Because women are more likely to leave and then re-enter the workforce, they often have diverse skills and more work experience than their male counterparts, and greater tolerance for risk.
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Negroponte defied congressional expectations by building an empire a bloated office with over 1, 000 employees, many of them torn from their line responsibilities elsewhere in the community and the often-important work they were doing there.
They are often exploited by unscrupulous recruitment agencies whose exorbitant fees mean they start work with heavy burdens of high-interest debt, or by employers who withhold workers' passports and don't bother abiding by health and safety laws.
Having reached their 30s or 40s, when they can no longer do mind-numbing, fast-paced and finicky work on production lines, they will often go back to the countryside.
They must learn Portuguese, work in often difficult conditions and, in some cases, avoid police raids.
They tend to work extremely hard, often holding more than one job.
Today, though, these groups are powerful enough to boost the cost of any government initiative--because often they require high salaries, costly work rules and, most important, pension benefits.
When I talk to men and women in their 50s and 60s who've decided to take on encore careers as teachers, they tell me that the work is often exhausting and stressful.
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And indeed, the negotiating process has not been simple, but again, our negotiation teams have been working in a highly professional, constructive way that has been lots of work and very often they worked 24 hours a day.
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They are often reluctant to go back into formal work until the two-year payment period is over.
"Quite often people do this work when they're starting out, " said Grant Wilfley, whose New York casting agency has supplied extras to movies like "Tower Heist, " "New Year's Eve" and "The Bourne Legacy, " due out this year.
Defence officials from each side will meet more often and will work to see where they can co-operate on security.
Creativity and the sharing of information is often lost when people work independently because they are not stimulated and informed by social interaction.
Many of them have complex personal histories, backgrounds and different ability levels that often mean they are not easily going to find work.
It is also giving parents much greater flexibility in their working life, where previously they often had none, or indeed little incentive to work at all.
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But more often they are simply excuses for doing the real work and experiencing the emotional discomfort inherent in making meaningful changes in our work and lives.
When they get fed up with work technologies, employees often become digital rogues, finding sneaky ways to use better tools that aren't sanctioned by the IT department.
Top politicians from other countries often engage in charitable or diplomatic work when they retire.
They work hard, contributing to our society, often doing jobs native-born Americans will not do.
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