“Dawa ya Mende! Ya Panya! Ya Mende! Ya Panya! Cockroach Murderer! Cockroach Killer! Ya Mende! Ya Panya! Ua Mende! Ua Panya!” the man standing outside Muthurwa market screams all day. Unlike his colleagues in the business who have acquire a small public address system and then recorded themselves so they can just stand there as …