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Example:
Lets look at this senario. You have 1 hoplite, and the resources to research the medium upgrade which would increase the power of your hoplite by ~10% (se note on power below). For the same price as the medium upgrade you could build three more hoplites, thus increasing the power of your army by 300%.
Obviously at this point researching the medium upgrade would be a silly decision.
NOTE: POWER
Assuming thewesson is right (and I think he is) the power of a unit is determined by how long it survives (hp) and how much damage it does while allive (damage). Thus I've considered the medium upgrade to be worth only a 10% increase in unit value (rather than 20%).
I've calculated the point at which it is more economical (in villager seconds) to research the medium upgrade than it is to build more units (to increase the power of a particular group of units).
Exception: I worked with the heavy upgrades in the case of chariot archers, camelry and elephants.
Greek
UnitUpgrade to medium wih (units)
hoplite__________30
hypaspis_________33
toxotes__________34
peltast__________39
hippikon_________27
prodromos________27
Egyptian
UnitUpgrade to medium wih (units)
spearmen_________27
axemen___________28
slingers_________25
chariot archer___22
camelry__________26
elephant_________13
Norse
UnitUpgrade to medium wih (units)
ulfsark__________27
throwing axemen__27
raider___________37
huskarl__________21
jarl_____________25
arod324, if you've got the time could you check my numbers? I can mail you the spreadsheet if you want.
EDIT: villager seconds for the norse for any gold cost were calculated at the dwarf mining rate so are actually dwarf seconds. All egyptian rates were calculated at the un-empowered level.
EDIT: I've done some testing and as far as I can see thewesson is correct. To the best of my knowledge the numbers here are now accurate and I will definately be changing the way I play based on this analysis.
[This message has been edited by The Devil (edited 11-20-2002 @ 09:40 PM).]