Mirage at the Bottom of the Pyramid?

Aneel G. Karnani counters(PDF) C. K Prahalad's assertion about a fortune at the bottom of the pyramid:

We argue for the need to view the poor primarily as producers, not as consumers. Rather than emphasizing selling to the poor, we should emphasize buying from the poor. By far the best way to alleviate poverty is to raise the income of the poor. Even though the BOP proposition conceptually focuses on the poor as consumers, it sometimes cites examples of successful organizations that treat the poor primarily as
producers... In discussing solutions to poverty, it is useful to conceptually separate the role of the poor as consumers and producers...The poor often sell their products and services into inefficient markets and do not capture the full value of their output. Any attempt to improve the efficiency of these markets will raise the income of the poor.