Alistair Darling has stated that economic arguments will decide Scotland's future in the forthcoming referendum on independence.
Speaking to BBC Scotland, Darling argued that all questions about Scotland's future were secondary compared to the economic ones.
"The decision will be made fundamentally on the economic arguments, on what currency we're going to have, are we going to get into the European Union? Are we going to be worse off or better off?
"I think if you look at all the evidence we've seen so far, it's those fundamental economic arguments that will clinch it, especially amongst the undecideds," he said.
Darling warned that the unionist Better Together campaign must not become complacent in the run up to the vote.
"There's a strong positive case to be made for the United Kingdom, we have the best of both worlds with the Scottish Parliament, but we are also part of something larger. It's good for businesses, it's good for our security.
"At the same time, we've got to persuade those people who are already convinced of our argument they cannot be complacent.
"I think this is going to be a lot closer than people think and this is something where we really do need a high turnout so that we get a decisive result."
Deputy First Minister Nicola Sturgeon appears to be in agreement with Darling for once; she recently told BBC Scotland: "I firmly believe who wins the economic argument will win the referendum."