Offer specific and easily accessible Tax reliefs to Companies which are defined as Small, Medium, or large, in return for them using Micro-entities and the Self-employed (SE) in thier supply chain. (Company sizes as defined in the Companies Act 2006, c46, Pt 15, Ch 1.)
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This will boost the UK economy & make it more resilient by stimulating the movement of cash.
Govt support on starting a business has made doing so easier. The real struggle is growing to a sustainable size, because Micro-entities & the SE mostly deal with similar sized businesses; meaning access to a very limited pool of cash. Micro entities can often provide much better value to clients, which means everyone benefits through competition & innovation and distribution of wealth via enterprise.