> No buying or purchasing happens when things are priced at zero. One could make a good argument that the air is worth zero. Yet one would be wrong: http://ww

> No buying or purchasing happens when things are priced at zero. One could make a good argument that the air is worth zero. Yet one would be wrong: http://www.telegraph.co.uk/news/worldnews/asia/china/12051354/Chinese-buy-up-bottles-of-fresh-air-from-Canada.html http://www.telegraph.co.uk/news/worldnews/asia/china/1205135...