I think the question is really what the market will sustain. The social impact bonds depend on private investors being willing to wait however long to get paid back. The ones we've seen so far, which as we've said are very new, the pilot ones, are of relatively short periods. It's possible that, particularly if you have philanthropic investors rather than profit-motivated ones, they might be willing to wait longer periods, but that's not yet known.
On May 15th, 2014. See this statement in context.