Kendodd
I think tax is a bit of a red herring to be honest. The problem is the hoarding of profits at the very top rather than giving workers (who there'd be zero profits without) not getting their fair share. At the rate the country is going we'll end up with one person owning everything and everyone else scraping by.
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Without the shareholders investing capital in the business there would be no profits. Let's take the example of a pencil factory, it needs capital to pay for the raw materials (wood, paint, graphite etc) and for the machinery to produce the pencils etc. In return for risking their capital if the business is successful the shareholders get to keep the profits, if unsuccessful the shareholders lose their capital.
The workers on the other hand invest their time and in return get paid a wage maybe a bonus if the business is successful, if the business is unsuccessful then they lose their job.
If you force companies to give workers "a fair share" of the profits then this would mean the shareholders get less return on their capital in the business.
Whilst this might work in businesses which are highly profitable (so there is enough profit to share around) or established businesses where the initial risky few years has passed and profits are more dependable, it most certainly would not work in businesses where the profit margins are tighter or on new businesses where there is significant risk in the early years (investors would just not invest).
If n businesses such as law firms or accountants where knowledge, skills and human capital are more important than tangible capital such as machinery or raw materials then such businesses have to pay the workers much more, because without them the business could not function.