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How is planetary trade income determined?

Arqade Asked on July 25, 2021

I’ve observed some strange patterns in trade income in Slipways (looking at the info screen for a planet, observe the value indicated for ‘trade income’). While playing on Tough difficulty,

  • Most planets appear to earn you 4 credits per trade they send out.
  • When a planet is struggling or sending to a struggling planet, they only appear to award 3 credits
  • Prosperous planets seem to award between 4-5 credits per trade.

While, when playing on Challenging;

  • Most planets now earn 5 credits per trade sent out
  • But now some successful planets award 6 credits for some of their trades as well.
  • Prosperous planets can even award 7, but this is rarer than before.

What is happening?

One Answer

Trade income calculations appear to round multiple times in multiple different ways. There's also a hidden multiplier, but it acts diffrently from the game's other income multipliers. This makes the actual trade income appear to be mysteriously inconsistent. Denote the trade income of a colony as T(c).

T(c) = round((Σ(floor( b * (e(I) + e(E) + 100%)))) * (100% + M))
Where: 
M = income bonuses from technology/perks
b = base income, depends on difficulty
e = export multiplier for
    I = importer
    E = exporter

The base income per difficulty is the following:

Forgiving       7
Reasonable      6
Challenging     5
Tough           4

The income bonuses from technology/perks are additive. So a planet with Machine interfacing +30% and Economic Zones +60% will have M = +90%

The export multiplier e(I) + e(E) depends on the state of the importing and exporting colony. It's the sum of the percentages applied as a multiplier. These are the following:

struggling    -25%
established     0%
successful    +10%
prosperous    +20%
legendary     +40%

So, for example, a Successful planet sending something to a Struggling planet would have a 10 - 25 = -15% modifier, which results in an income contribution of 5 / 5 / 4 / 3 credits on each difficulty, respectively.

Correct answer by aphid on July 25, 2021

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