In the first programme of the new series, presenter Evan Davis (pictured) meets the "appreneurs" trying to make money in a marketplace where traditional business rules do not apply – the app industry.
Becoming an appreneur is easy. All you need is a computer, a couple of hundred pounds, and an idea.
Thousands of new apps are created every week to serve the ever-growing smartphone and tablet computer market.
But what happens next? How do you make a living if your product is free? How much can you charge when buyers expect a lot for very little? And how do you market to customers without knowing who they are?
The guests on this week's programme are Barry Meade, co-founder of Fireproof Studios; Professor Anthony Steed, co-founder of Chirp; and Max Whitby, co-founder and CEO of Touch Press.
The Bottom Line aims to cut through the statistics and spin and get a clearer view of the business world by talking to the people running leading and emerging companies.
It is broadcast every Thursday on BBC Radio 4 at 8.30pm, and shown on the BBC News Channel at weekends. It is also broadcast on the BBC World Service and BBC World.
You can listen to or watch past episodes, and get full details of upcoming broadcasts, on the BBC website here.
Get extra insight into the issues discussed on the OU's OpenLearn website.