Desiging New Technologies for a Better Life – “Polak discovered how important affordability was when he sold two kinds of lug wrenches to Somalian donkey-cart owners. One was a $12 wrench with a lifetime guarantee, and the other was a $6 wrench that would soon break…the donkeycart owners preferred to buy a wrench they could afford today, to make more money for tomorrow, than a wrench they would have to save for, and risk going out of business from a flat tire in the meantime.”