The size of people in the 'Lifeanddeathworld', written as one word, is dependent on how much money they have. To move from being the size of rats, the ‘littlepoor’ people need to accumulate ‘munmun’ which will allow them to Scale Up - perhaps becoming ‘middlepoor’.
An essay on industrial capitalism arguing for a recognition that, for all the personal benefits it may bring, it does so at the cost that can't be sustained.