https://leagueoflegends.wikia.com/wiki/Gold_efficiency#Base_Statistic_Prices
notice anything strange here?
once point of magic resist costs 18 gold one point of armor costs 20 gold
2000 gold worth of armor would get u 100 armor where as 2000 gold of MR would get you 111 MR yet.. Magic resist is WAY more effective at counter AP champs than armor is vs AD champs
like really riot? why is MR LESS EXPENSIVE if it is MORE EFFECTIVE?
MasterDClone3 votesthere are fewer mr items as oppose to armor items, you can only build 3-4 mr items while you get the choice to like 12 armor items
HP Crookshanks2 votesIt's actually 13 vs 15.
Magic Resist: 
Armor: 
Despite the obvious dominance of ADs over APs, MR items are much more cost effective and powerful (especially 
). Armor is rarely built compared to MR because armor difference is hardly ever noticeable despite AD champions being far more popular than AP champions.
MasterDClone2 votesLets take out 
simply because they give mixed stats and when you look at the amount of stats given they cancel out. (i dont know why zz rot doesnt show up as an armor item on their website, so it's 14-16)
Now lets look at mr items amount of mr given:
-- 60 mr
-- 55 mr
-- 50 mr
-- 40 mr
-- 35 mr
-- 30 mr
-- 25 mr
Armor stats given :
-- 100 armor
-- 80 armor
-- 65 armor
-- 60 armor
-- 50 armor
-- 45 armor
-- 40 armor
-- 30 armor
-- 20 armor
Now that we can see the fact that armor items give more armor than an mr item it is only natural that mr becomes more powerfull because it is more effecient to buy 1 item that give u 100 armor than 2 that give you 110 armor, when you would need to spend your resources elsewhere.
The thigh guy3 votesNot to mention how every armor item may as well have 59% of it armor stat removed because of all the pen in the game.
SwiftKitten881 votesNot to mention how every armor item may as well have 59% of it armor stat removed because of all the pen in the game.
basically.. where as the only real magic pen item is 
sure there is 
and then there is 
if u are willing to not grab
but for the most part 1 mr item will save u from getting 1 shot unless they are a huge lead
where as 1 armor item. unless its something like wont do jack shit.
and outside of bruisers and tanks really isnt an option u cant tank
is efficiency gated by the active, and also prevents you from stacking
where as AD champs (if you had an AP champ who was enough of a threat to warrent it)
can go and even
or any 2 combaines and just completly laugh at you.
there is WAY too much armor pen and not enough armor options, where as magic pen while certainly available, is something u have to make an important choice over
or
or
ok that one u dont..
mages are literally FORCED to go glass cannon while AD can stack MR while still going full damage.
can ulti 3 times before is back up
he will effectively negate all the armor it has on it, and sure while ge does have counterplay becuase i know he will spawn directly behind u and u can work around that with skills or the passive of if its up..
we cant just "buy more armor"
(and yes this is my threat i can bump it if u want to) the point is still highly relevant.. now that a a least a small portion of damage creep has been addressed we need t deal with the compete lack of resistances that armor provides
The thigh guy1 votesi think the solution is to make the black cleaver passive only apply to the champion who bought it. suddenly the entire enemy team isnt ignoring 24% of your stats.
and i think that lork dominik's should be reverted back to the giant slayer version, where you got 15% armor pen, but also did more flat damage based on their hp. It was a way to cut through tanks for sustained dps like it should be, not a way to nuke tanks into orbit.
AirKingNeo2 votesMagic damage has the inherent advantage of being better than physical damage, and most tanks/bruisers have to itemize more armor than MR, so to compensate, MR is a bit more gold efficient. This is especially fair for bruisers as they get less tanky items, but still shouldn't be full comboed by mages.
HP Crookshanks3 votesHow is magic damage is better than physical damage when a single MR item halves the magic damage taken?
AirKingNeo1 votesbecause what you just said is an exaggeration.
Also because peopel buy more armor than they do MR since physical damage is more common.
Even2 votesNot saying ap champs are good, but i think its bc is stronger than 