Based on that definition of persistent poverty, that would be the case. There are a few ways of measuring persistent poverty. One is, for example, over six consecutive years. They all show roughly similar trends, so certainly if you have a very high income one year and zero the next, you could have a cumulative income over six years, but if you look at the range of different definitions, those groups certainly show themselves to be at particular risk of persistent poverty.
On April 10th, 2008. See this statement in context.