To calculate the market values of peat extraction, data on extraction and prices for 2008 to 2012
are taken from the UK Mineral Yearbook 2013 produced by the British Geological Survey. The data
are based on export values and volume for the respective year. The unit price of peat extraction is
derived by dividing the export values of a year by export volumes of that year. The prices for all the
years are deflated using GDP deflators to obtain the values in 2012 prices.