Why is it so expensive to live in London?

The richer the country, the higher the cost of living. Prices that you see in supermarkets and cafes of London generally are higher (in nominal terms) than those in Baku or Gaborone.

(a) (10 rp) For different goods and services, this effect is different. Provide examples of goods or services which typically cost almost the same across the world. Provide examples with high price differences. Explain.