There are few things more difficult than starting your own business. Studies show that as many as 60% of firms close their doors within three years.

For those of us in the startup world, the same question often arises: what causes the downfall of so many promising businesses? Well, the relative strength of the core proposition is undoubtedly the most important determinant of success, with research showing as many as 42% of companies fail because their central product idea is weak....