De Beer notes that a large portion of USAID money goes to big for-profit companies which results in much of the money going back to the donor country through profits, consultant salaries, and procurement regulations under which materials are not necessarily purchased in Afghanistan.

NPR: Westerners Play Pivotal Role in Afghan Rebuilding

Each looks at the prices of hundreds of things we commonly spend money on, including bread, cinema tickets and pints of beer - and tracks how these prices have changed over time.

BBC: Q&A: Inflation explained