Why do the text authors contend that the nonprofit sector is large, growing, important and challenging?

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The Answer is .Nonprofits comprise between 8 - 10% of the labor force
.Volunteering is a major activity - 28.8% volunteer
.The Nonprofit sector has been growing faster than any sector but technology
.Internationally, nonprofits are strong and growing at a dizzying pace
.The sector is populated with a number of very large, very sophisticated organizations - the top five nonprofits took in more than $4 billion each in 200t
.Major donations of folks like Bill Gates and Warren Buffet have raised the profile of the sector

Why Do the Text Authors Contend That the Nonprofit Sector