Other People’s Money: Masters of the Universe or Servants of the People?

We all depend on the finance sector. We need it to store our money, manage our payments, finance housing stock, restore infrastructure, fund retirement and support new business. But these roles comprise only a tiny sliver of the sector’s activity: the vast majority of lending is within the finance sector. So what is it all for? What is the purpose of this activity? And why is it so profitable?