2010 Business Model Marketing Microfinance 
Harvard Business Review
JUNE 13, 2012
cents for a sachet that could purify 10 liters, Pur achieved penetration rates of 5% to 10% in its test markets — strong by almost any yardstick — but in 2005 the company gave up on Pur as a business, because the numbers simply hadn't worked. The microfinance industry is a rare D and E success story.
Harvard Business Review
MARCH 4, 2013
Which are likely to achieve significant social impact within an attractive business model? Here, we gleaned some additional insights from a separate analysis of 281 social ventures that applied to participate in the 2010 or 2011 Summer Institutes run by the Unreasonable Institute , the Colorado-based social-enterprise accelerator.
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