If one has -100% upgrade cost, is everything free?

[SimonH]

Title ^

Thank you.

[KarenWill]

No
Stop being dumb
Thank you

[786TRYX]

Your answer was dumb.

But anyway, sure, pretty sure gree doesnt give anything for free. They even take bonuses from ones acc just when they want to (droid user)

[Dirty Mind]

Yes, mine is -110% so they pay me to upgrade my buildings

[Thief]

Title ^

Thank you.

In theory it can't ever reach 100% as its multiplicative not additive.

Otherwise I would have ended up with over 100% health regen based on the units I have.

[KingDante!]

What Thief said

[SultanB]

There are two categories of boost effect, and the two categories have a different formula for how multiple sources of the same bonus are applied. The first category of boosts are the ones that raise a number. An example would be the boost that gives a flat bonus to defense buildings (it raises your defense from buildings). Multiple sources of these boosts are additive. For those faction bonuses, you will see a progression of 5% / 10% / 15% / 20% / 25%.

The second category of boosts are those that lower a number. An example of this category would be casualty rate reduction (it lowers the casualty rate). These boosts are multiplicative. Multiplicative bonuses are determined by subtracting the bonus from 1. So a 5% bonus is .95 (1- .05), and multiplicative bonuses are multiplied together. This type of mechanic is common to games in general, usually relating to things that cannot logically go above 100%. A common example would be an evasion mechanic of some sort; you can't evade 150% of anything.

Here's a concrete example from one of the developers:

If a player has two 5% multiplicative bonuses and two 15% multiplicative bonuses of the same type, instead of having a combined 40% bonus, he would have a combined 34% bonus (.95*.95*.85*.85) = .652, which, when subtracted from 1, is .348, or a .34 (34%) bonus. Compare this with two additive bonuses of 5% and two additive bonuses of 15%, which would look like 1 + .05 + .05 + .15 + .15 or 1.4, or a combined 40% total bonus.

Although the examples given above reference the faction boosts, this also applies to personal boosts from units or buildings that display on the profile.

[YankeePhil]

Exactly, that's why max health regen for a faction is -30% and not -35%. (095x0.95x0.95x0.95x.095x0.95x0.95 = 0.698 which is 0.70) and 1-0.70 is 0.30 which is -30%

[EZfodder]

In theory it can't ever reach 100% as its multiplicative not additive.

Otherwise I would have ended up with over 100% health regen based on the units I have.

In praxis my building cost reductions is additive. I know and understand that health regen is multiplicative, but wonder about the building cost

[Sheriff Hoyt]

Here is a email response straight from GREE's generic email system:

Hello,

Thank you for contacting GREE Support.

Certain types of boost, generally those that make something smaller, fewer or shorter(i.e. "fewer casualties", "shorter upgrade times", "less time till your health refills") have diminishing returns when there are multiple sources of that boost on your account or faction. What that means is, each new source of that boost that you add is slightly less effective. So for instance if you have a 5% health regen boost effect and then another 5% health regen boost is added, you would see a total boost effect of 9%.

This is intentional, because these boosts cannot logically go below zero. It's impossible to have faster-than-instant upgrade times, for instance. Or to have a casualty rate modifier so low that you actually get units back. So for these boost types, we have the diminishing returns effect stated as above. New sources of the boost will still add to your total and progress you, though. Boost effects that ADD something (more attack, more defense, etc.) theoretically have no logical upper limit, and those stack normally (5% extra attack boost + 5% extra attack boost = 10% extra attack boost).

Regards,

Ben Scott
GREE Support

[Paisthecoolest]

Yes, mine is -110% so they pay me to upgrade my buildings

Shh! Don't let Gree know about the newest glitch.