- Selling fee 50% --> banter upgrade
  \ level 1 40 % - no deps
  \ level 2 30% - use your explosive to have better deals
  \ level 3 20% - use your efficiency module 2 to sell better (you tried with efficiency module 1 it did not work)
  \ level 4 10% - ? 

- Combinator read market prices
- Settings for market fluctuation configuration
- configure number of chest levels (are 250 chest too big?)
- Transaction logs
- stats Graph / income vs. expenses
