reporter: agnes muhavishe has been living here in mathare for 18 years now. the slum of mathare so my children could go to school. there's work for rit now. i used to get by on day labor toay the schl fees. the coronarus made tngs a lot harder. there are jobs anyme. i don't have money for food or rent. everything's become much harder because there are hardly any chances left to earn mon. sometimes i'm so stressed i get sick. reporter: her ight is a mmon one he. lifen the cityan quickly sometimebecome a trap.sed i get the informal economy has a stranghold on e slum. foodwater, elericity, and rents all cost more thann the countryside. peter chege keeps meticulous records. those who pay get a receipt. those who don't can expect a visit from a seet gang. ter: the young gangs know the locals here even better than the police. they're always willing to collect the nt. if you go to the police, they'll asyou for a pile of money first. you end up paying more than the 6000 shillings the tenant owes you. reporter: agnes muhavishe lives with her husband, cldren, and grand