Startups are often very undercapitalised, but I found that to be very beneficial because it forces you not to throw money at problems. Instead, you learn all the nuts and bolts of what you're doing and become an expert.

Don't just do something because it's a trendy idea and will make you a lot of money. The reason I say that is because any kind of venture involves going through difficult times. If you're doing something you are passionate about and really believe in, then that will carry you through.

So much business is based on the belief that we should do whatever we can within legal limits to make as much money as we can. Ben & Jerry's was based on values, and we try to operate a business that not just sells ice cream but partners with all our stakeholders - whether that's suppliers or customers - to bring about a more sustainable world.

One of the great things about Ben & Jerry's for me is that not only is it delicious, but I get it for free.

It's to be expected that you make mistakes when you're breaking new ground.

Ben & Jerry's evolved into what it is doing and is trying to transition its supply chain, but this is essentially retrofitting. In the social enterprise movement, we see companies whose essence, the products they make, the reason they exist from day one, is because these people see something out in the world that they cannot accept.

Startups are often very undercapitalised, but I found that to be very beneficial because it forces you not to throw money at problems. Instead, you learn all the nuts and bolts of what you're doing and become an expert.