TradingLimits caps each deal (maxAttachments 3, maxDealsPerDay 0 unlimited, expirationTime 900 s, maxAdverts 5, advertDuration 172800 s = 2 days). TradingTax applies the matching bracket by deal size: up to 500 free, then 10/20/30/50 percent. 
<TradingLimits maxAttachments="3" maxDealsPerDay="0" expirationTime="900" maxAdverts="5" advertDuration="172800" />
<TradingTax>
  <Limit moneyMax="500" tax="0.000000" />
  <Limit moneyMax="2000" tax="0.100000" />
  <Limit moneyMax="18446744073709551615" tax="0.500000" />
</TradingTax>
Free-market localhost: set every tax to 0.0 and maxAdverts higher. Mail cut is separate: MailTrading tax in special_values.xml plus Lua store_maxTransactionSum cap.
Additional Notes: 

Mail tax and trade tax are two separate cuts.

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10 + 3 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.