Why should people be concerned about Brexit? Because Britain as a full member of the European Union is part of an open internal borderless market of four hundred and eighty million persons.
Britain on leaving the European Union (especially if that is on the basis of no deal) will be a border enclosed market of sixty million persons with tariffs and other restrictions placed on goods and services exported from the United Kingdoms shores.
Now, many manufacturers and large service providers are looking at forward planning investment and placing that investment in European Union member states as that will be the largest and most open market into the future.
Relocation is becoming the "order of the day", and where those large corporate organisations go, their suppliers both large and small are following.
The above means that the "tax take" from those companies to the government will become far less and in time that will impact on any governments ability to pay pension benefits etc.
Of course, the no-deal Brexetiers do not wish to draw the British publics attention to the above.