Markets

With markets and banks when it says it increases tax revenue by 50% is that 50% of your total commerce or just of money broughtin by tax collectors

That is 50% of the part of your commerce that does not go into entertainment or science.

UPDATED because of replies from Tone and TimBentley!

it is calculated like this:

Yield per tile =
natural terrain yield +
(bonus) resource +
river bonus +
road +
government bonus (republic, democracy)+
golden age +
collosus +
commercial dock. (water tiles only)
- government penalty (despotism, anarchy)

Total yield from tiles = the yield collected by every citizen in the city working a tile + city center.

Base commerce= Total yield from tiles + total tourist income from all wonders.

Net commerce = Base commerce - corruption. (corruption is always 100% under anarchy)

------------ This block isn't 100% accurate, see quote by TimBentley below...------------
Base tax = net commerce * tax slider %
Base science = net commerce * sci slider %
Base lux = net commerce * lux slider %
--------------------------------------------------------------------------------------------------

Net tax = base tax * sum city-improvements multipliers + (tax collector specialists * 2) + wealth
Net science = base science * sum city-improvements and wonder multipliers + (scientist specialist * 3)
Net lux = base lux (no city improvements or wonders multiply this in the epic game, but it is possible in some scenarios)

The multipliers work like this:
Base tax + (Base tax * multiplier structure 1) + (Base tax * multiplier structure 2) + etc... Same for science. And then the result is rounded.
So if you have both a market and a bank then the total multiplier is 100%

Example: a city size 24, in republic, no rivers, no bonuses on the terrain, 12 sea tiles, and 8 land tiles with road, 20% corruption, sliders are 6/2/2 (sci/lux/tax) 3 scientist and 1 taxman.
The city has the commercial dock, a marked a bank, a library, a university, newtons university (4 tourist money)
The total yield from tiles is: 24 from sea 8 from roads 12 from commercial dock, 1 city center. 21 government bonus = 66
Base commerce = 66+4 = 70
Net commerce = 70*0.8 = 56
Base tax = 56*0.2 = 11.2 --> 11
Base sci = 56*0.6 = 33.6 --> 34
Base lux = 56*0.2 = 11.2 --> 11
Net tax = 11.2 +5.6(market) +5.6(bank) +2 (taxman) = 24.4 --> 24
Net sci = 33.6 +16.8(lib) +16.8(uni) +16.8(newtons wonder) +9 (scientist) =93 --> 93
Net lux = 11.2 --> 11

Or even more accurate: (but I didn't want to rewrite my whole story)

TimBentley said:

More accurate would be to say
if sci+lux<100%
Base science = net commerce * sci slider %
Base lux = net commerce * lux slider %
Base tax = net commerce - base science - base lux

if sci+lux=100%
Base science = net commerce * sci slider %
Base lux = net commerce - base science
Base tax = 0 (obviously)

Click to expand...

This is usually the same as my own formula, but it explains why sometimes, your happiness is effected when you move the SCI slider.

If the city makes an odd number of commerce (say, 37), and you have both a market and a bank and run 100&#37; tax... does it round each? or does it add then round? ie - do you end up with 74 GPT, or 73 GPT?

AutomatedTeller said:

If the city makes an odd number of commerce (say, 37), and you have both a market and a bank and run 100% tax... does it round each? or does it add then round? ie - do you end up with 74 GPT, or 73 GPT?

Click to expand...

To be honest, I never checked that out myself. (but I'm guessing it is calculated for every structure separately)

Banks do nothing if you are running zero taxes, so be sure it will yield a profit before you build them. If you running 70&#37; science and 30% lux a bank will be a waste, except any turns you are able to drop the slider.

Thanks alot guys.

AutomatedTeller said:

If the city makes an odd number of commerce (say, 37), and you have both a market and a bank and run 100% tax... does it round each? or does it add then round? ie - do you end up with 74 GPT, or 73 GPT?

Click to expand...

There's a post by Tone in the S&T forum which said essentially that the first 1/2 (from the market) would round down, but the 2 halves would add together to make 1. Based on that it should be 74 GPT. He was actually discussing libs and unis, but it would work the same way.

Let's see if I can make a link to a single post work. http://forums.civfanatics.com/showpost.php?p=5006887&postcount=90

gmaharriet said:

There's a post by Tone in the S&T forum which said essentially that the first 1/2 (from the market) would round down, but the 2 halves would add together to make 1. Based on that it should be 74 GPT. He was actually discussing libs and unis, but it would work the same way.

Click to expand...

Just to confirm this, I found an old save which had a town with a market, bank and a stock exchange. (It took a bit of searching as it's rare for me to even build a bank!!) I calculated the base commerce and then checked my calculations fitted the actual situation. I also removed the buildings one by one to double check. The commerce is added for each building without rounding and then once the final total is calculated, any remainder is rounded down.

On your formula MAS, could I suggest a small correction? Base lux is, to the best of my knowledge, total commerce less base tax less base science. Often this is the same as what you have but not always. This is why the base lux can sometimes change when altering the science slider.

Tone said:

On your formula MAS, could I suggest a small correction? Base lux is, to the best of my knowledge, total commerce less base tax less base science. Often this is the same as what you have but not always. This is why the base lux can sometimes change when altering the science slider.

Click to expand...

More accurate would be to say
if sci+lux<100&#37;
Base science = net commerce * sci slider %
Base lux = net commerce * lux slider %
Base tax = net commerce - base science - base lux

if sci+lux=100%
Base science = net commerce * sci slider %
Base lux = net commerce - base science
Base tax = 0 (obviously)

Ok, a really dumb question here. I'm an idiot, I'm old, I went to school several centuries ago, and I never was good at maths.

What does "netto" mean? It's a term I've never come across before today.

I don't know why I hadn't changed that to "net" when I copied and pasted. "Netto" is "net" in several languages, including Dutch.

Thank you, Tim, for improving my vocabulary. I can read a bit of Spanish and French, and now know a word in several more languages. I don't suppose that quite qualifies me as multilingual, does it?

TimBentley said:

I don't know why I hadn't changed that to "net" when I copied and pasted. "Netto" is "net" in several languages, including Dutch.

Click to expand...

Yeah for Dunglish. (dutch variant of Engrish)

We are secretly installing dutch culture into everyones mind via the internet.
Yup, the dutch are at it again, a second golden age in the making, first we ruled the seas, now we'll rule the internet... MHuahahahaha...

(doesn't make sense anyway because "netto" is a word the dutch accountants borrowed from the Italian language. So actually it are the Italians secretly taking over the world... conspiracy theories ensue!)

PS: since I was caught in my attempt, I fixed it, to cover my tracks...

And now the brain will need to ponder on another way to take over the world