A large city is a threat and an opportunity. A modern city is also called a metropolis for its complex functions and relations amongst the dwellers. It is a threat to environment and peace because crime rates are high due to the differences between the rich and the poor. A policed order. A city is a place where the weak are exploited by the powerful and the rich, e.g. women and children were exploited in industrial cities of London, Leeds, Manchester, etc. On the other hand, it is an opportunity for those who are in power. Landlords benefit by raising the rents as demands for space increase. It is also an opportunity for women who are wage earners as they become economically independent. Social divisions based on class and caste also break down in different ways like travelling in public transport, etc.