Jeremy Corbyn is expected to outline 10 pledges on how to "rebuild" Britain as he claims everyone can have "richer" lives.
The Labour leader will continue his campaigning in east London with a focus on how he wants to develop the country alongside efforts to transform his party.
Mr Corbyn is the frontrunner in the leadership contest involving fellow Labour MP Owen Smith, with Thursday's speech an attempt to further his own vision following a series of policy announcements from his rival.
In a speech in Dagenham, Mr Corbyn plans to reiterate that the UK's economic model is "broken" and outline how the country can respond.
He is expected to say: "There is immense potential in the skills and talents of our people and huge opportunities ahead of us in science, technology and culture.
"We could all be living richer lives in a sustainable, more prosperous and more caring society.
"Labour will pledge to rebuild and transform Britain with a bold £500 billion programme of investment.
"We will deliver the transport and communications infrastructure a modern economy needs, not just in those places where the economy already works but right across the whole country.
"We will back this up with new institutions able to deliver the investment our communities so desperately need.
"A new £250 billion national investment bank, backed up with a network of regional development banks, will put power to determine their own futures back into the hands of those places outside of Westminster and the City of London."
Mr Corbyn has previously laid out a series of pledges aimed at ending "rip-off Britain" and tackling "injustices" in the workplace, including the banning of zero-hours contracts, increasing the living wage and repealing the controversial Trade Union Act - which places restrictions on strike ballots.