Entrepreneurship in the Informal Sector

How many businesses start-ups conduct some or all of their trade ‘off-the-books’? And how many enterprises continue to do some of their work off-the-books once they are more established? What should be done about them? Should governments adopt ever more punitive measures to eradicate them? Or should we recognise this hidden enterprise culture and attempt to harness it? If so, how can this be done?...