Labour's newly announced policy on research funding for new medicines raises big questions about the balance between private profit and public good.
The party wants to make big drug companies hand over their exclusive research details so medicines can be made and sold more cheaply by others.
Should major drug companies have the right to benefit from their research investment through exclusive rights to sell new products over a decade or more?
Or should the government have the right to over-ride that when certain potentially life-changing medicines are deemed too expensive for NHS patients?
It was not surprising Jeremy Corbyn chose the example of the cystic-fibrosis drug Orkambi.
It has been a high profile and long-running saga, with NHS England and the National Institute for Health and Care Excellence unable to agree a deal with the manufacturer, Vertex.
The official listed price is more than £100,000 per year per patient, though the company has indicated it would be prepared to negotiate and the Scottish government has reached an agreement to purchase and supply the drug.
Mr Corbyn referred to the case of nine-year-old Luis Walker, who has four hours of treatment a day but whose life might be very different with Orkambi.
He said: "Luis, and tens of thousands of others suffering from illnesses such as cystic fibrosis, hepatitis C and breast cancer, are being denied life-saving medicines by a system that puts profits for shareholders before people's lives."
What is Labour planning to do if elected?
In essence, Labour wants to over-ride, in some circumstances, the patent system that allows drug companies to prevent others from replicating their new products over a defined period of 10 years or more.
A patent typically lasts 20 years in total, though this includes the time to complete trials and get regulatory approval.
The Labour leader made this pledge: "We will create a new publicly owned generic drugs manufacturer to supply cheaper medicines to our NHS, saving our health service money and saving lives."
The policy would utilise an existing but rarely used power to create what is known as a Crown use licence.
This would grant a state-owned company access to a drug company's intellectual property in return for a relatively low payment.
Labour's policy document refers to a recent German court decision to award a compulsory licence on an HIV drug and a similar move in Malaysia for a hepatitis C treatment.
The other strand of the Labour policy would ensure taxpayers benefited from new drugs developed by big companies in collaboration with public research bodies.
Some new medicines brought to market by the companies are based on initial research by other organisations.
Latest figures show annual research-and-development spending by pharmaceutical companies is £4.3bn, while public-funded bodies spend £2.4bn and medical research charities £1.3bn.
Labour quotes the example of Humira (used to treat arthritis and some other conditions), which is said to be the best selling prescription drug in the world but which was based on government-funded research in a Cambridge laboratory.
The party says if private corporations take forward these drug discoveries, they should make them available to the NHS at lower prices and ensure there is a financial return for the public sector investment.
What do the drug companies say?
Drug companies, while still studying in the detail, have unsurprisingly come out strongly against the plans.
The Association of the British Pharmaceutical Industry said: "It would completely undermine the system for developing new medicines.. and discourage research in a country that wants to be a leader in innovation.".
The BioIndustry Association said the proposal "risks cutting off investment in the small companies up and down the UK that are working hard to develop new treatments for patients that have few options".
Industry sources point out that public funders often come up with deals to give them a share of future profits.
This includes the Medical Research Council negotiating royalty payments with the company marketing Humira.
More generally, drug manufacturers make products freely available for some very sick patients on compassionate grounds.
With this policy, Labour is pushing new boundaries in its challenge to the big corporations across the economy.
The party says the pharma companies are vested interests making excess profits on public health.
Ensuring the best drugs at affordable prices for the widest number of NHS patients is the stated aim.
But the industry will warn a crucial chunk of the UK's academic and industrial base will be undermined, with jobs cut and patients losing access to innovative treatments.
Stand by for a titanic clash between a Labour government and the pharmaceutical corporations.