Jeremy Corbyn has repeated throughout the Labour leadership campaign his desire to end any prospect of renewing the Trident nuclear missile.
Quite apart from burnishing his left-wing credentials, since Labour abandoned its commitment to unilateral nuclear disarmament in the 1980s, the policy allows the long-time supporter of the Campaign for Nuclear Disarmament to make promises on public spending his rivals cannot match.
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The Islington North MP reckons the £100 billion saved could be re-directed to reverse austerity, giving him a largely costed plan to boost public services.
While arguing a secure world is "not created by an arms race", others would beg to differ as to whether abandoning the weapons system is a wise move in an unstable world.
In any case, this is a pick 'n' mix of what £100 billion could buy at the same time.
And there would still be enough spare change to buy £85 million of footballer in the shape of Gareth Bale, the world's most expensive player.