Productivity can be measured at a local authority level using gross value added data compiled by the Office for National Statistics. GVA in Shropshire is relatively low. There are a number of reasons for this, including Shropshire's traditional reliance on agriculture and related industries, where GVA generation is low compared with other sectors. The lack of corporate headquarters also has an adverse effect, as GVA generation is often attributed entirely to the HQ base rather than being split pro rata to branches. High levels of out-commuting, especially amongst top earners, also suppresses the value of Shropshire GVA (and particularly GVA per capita).