A few thoughts:
Medieval societies are often said to have spent about 90% of their workforce on farming. That would translate to 90% being Laborers. Most human societies had 2% warriors at any given time, which would probably mean around 5% of people being trained that way. The remaining 5 % would be the ruling caste (those members of it that are not Fighters, that is) and the clerus, or clerics and monks and the like.
In many magic systems, you'd find a lot of options to save laborers. While RoleMaster Unified has the option to rapidly grow crops (with the Druid base list Plant Mastery), I cannot find any spells that will really help with actually collecting the grain. The Closed Essence list Rapid Ways might save you some time, it is not an actual mutiplier due to MP cost, relatively low impact (just +25% speed for a few rounds). No masses of summonable working spirits to support the realm on an industrial scale are available either – I take the liberty to rule out necromancy here, and we don't have constructs or the like yet.
So, no great change for the vast majority of people from the existence of magic?
It kind of seems so. What RMU magic (as it is now) allows you is to live on less land, but NOT with fewer hands.
Thus for the vast majority of people, nothing changes in any of the three states.
Sure, there might be a few "combat engineers" called "Magicians", and medical care is dramatically better, but the gains from that will not be multiplicative, merely slightly increase output by a few percent, as they are largely canceled out by the losses to other people using malevolent magic.
Unlike in some other systems, we wouldn't get an "magical-industrial complex" of people changing the world akin to an industrial revolution.