In Zimbabwe, where hyperinflation has reached 7,900% and people have used up their entire savings just buying food, life has been reduced to this: the queue. Go to any Zimbabwean town these days and you'll find lines everywhere, like an invasion of giant pythons slithering into every supermarket door. Kaodza, a hustler in a country where the flour has all but run out and bread has become a luxury, gives a quick tutorial on how to get ahead in a queue. You don't just line up and wait to buy. There is an unspoken etiquette, with subtle rules. Only those...