Introducing the feudal system and why was this done?

Answer 1

The fuedal system was to do with the division of wealth and it's control, the movement from subsistence peasant agriculture to a system where landowners have the ability to make profit and tax their tenants/serfs. The best contrast is where the highlands of Scotland maintained their original "runrig" system whereby families rent was paid n military service to a clan and they could farm entirely for themselves compared to the lowlands where minor clearances occurred in order to establish a fuedal taxation system. Karl Marx wrote a very comprehensive history of the fuedal system in England which is by far the best reference on the subject from an economic point of view, for more factual accounts it would be wise to steer clear of that work.