I wrote an article inHarvard Business Review asking why can't we build a $300 house? Now, why do you need a $300 house? Just let us look at a simple fact. In the world today there are 75 million people who are homeless. 75 million is the size of the United Kingdom, the same number of people who sleep on pavement, for whom sky is the only roof. Is this right? Even insects have homes, do they not? Even a spider has a home, does it not? Why can't every human being have the right to have a home?