Elections in Britain have become the ultimate postcode lottery.
Our research shows that the parties spend 22 times more on some people's votes than on others, depending on whether they live in a safe seat or a marginal seat.
How much parties spend directly affects how likely it is that people will turn out to vote.
Our outdated electoral system, which creates too many safe seats, means that parties have no incentive to reach voters in places they are unlikely to win.
A fairer voting system would help to address this inequality.
Read our report Penny for your Vote for more details
And why not find out how much your vote is worth
with our interactive tool?