*Looks back at post* I forgot I say it, d'oh.

I'm sorry, my previous explanation did a very, very poor job of explaining.
Delling is correct. GDP=Gross Domestic product. It is basically is the total of all goods bought and sold in the economy.

Per capita GDP is the total value of goods bought and sold per person.

Thus, 'what is per capita GDP in Daventry' means basically 'how much stuff is bought and sold per person in Daventry'.
