Ed Miliband is describing how to move from the "casino banking we have to the stewardship banking we need".
He said banks no longer care about the success of the firms they lend to because they are too concerned with making an "immediate return".
He said banks should have a "fundamental duty to serve the real economy".
More top news
Police in Catalonia said the man killed was wearing what looked like an explosives belt.
As Big Ben falls silent for four years of renovation work, why not test your knowledge of the iconic London landmark?
Female football fans were asked to show their bras to stewards during security searches, a supporters' group has said.