A creative project by the BBC World Service is tracking how food prices have been changing since the autumn of last year.

BBC journalists in 8 world cities — Brussels, Washington DC, Skopje, Moscow, Buenos Aries, Jakarta, Delhi, and Nairobi — have identified 5 staple foods for the area where they are based. On a weekly basis, they then go out and purchase these same five items to determine the changing cost of food over time.

Interestingly, as this graph from the BBC site indicates, the four poorer cities — in Africa, Asia, and South America — have all been facing higher price increases since last autumn than the others, with Washington DC and Brussels seeing the biggest drop in prices over the same time period.