How does mentioning that rent is 70% of one's income indicate being from London?

It is not uncommon for people to say that rent in London is high. However, when someone mentions that rent is 70% of their income, it is a strong indication that they are living in London. This is because the high cost of living in London means that many people spend a significant portion of their income on rent.

London is known for having one of the most expensive rental markets in the world, with many people paying exorbitant amounts for small flats or rooms. This is due to a combination of factors, including high demand, limited supply, and the city's status as a global financial center.

Additionally, wages in London are often higher than other parts of the UK, but they are not always proportional to the cost of living. This means that even people with relatively high salaries may struggle to afford rent and other expenses in London.