Pupils from Pelton Primary School in County Durham are running their own "city" for the day.
They elect their own mayor, apply for jobs in the shops and bank, and decide rules for citizens.
The Enterprise City concept started in the USA and the children in Spennymoor are the first to do it in the UK.
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The constituency of Washington and Sunderland West includes the UK's largest car plant, which was opened by Nissan in 1984.
This seat was formed prior to the 2010 General Election, taking in Sunderland city centre and the Ryhope area to the south.
The constituency of Stockton South includes relatively affluent areas like Yarm and Eaglescliffe.