Karachi-Most Cheapest City To Live - Karachi is the largest city, main seaport and the financial capital of Pakistan, with a city population of 18.5 million. This largest city is found to be the cheapest city for the tourists and the foreign visitors. According to survey on 114 cities, Karachi comes at the last position. Pakistan's Federal Bureau of Statistics report says that a citizens of Karachi earn approximately 110 dollars per year.