fo2-barter.txt

Master_Trader = 0.0;
if (player_has_master_trader) Master_Trader = 25.0;

barter_mod = script_modifier + reaction_modifier; // reaction_modifier is -15/0/25 for good/neutral/bad.
barter_percent = (barter_mod + 100.0 - Master_Trader) * 0.01;

if (barter_percent < 0.0) barter_percent = 0.0099999998;

barter_ratio = [(trader_barter_skill + 160.0) / (highest_barter_skill_in_party + 160.0)] * 2.0;

total_price = caps_total + item_total_cost_without_caps * barter_ratio * barter_percent;

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example:
Eldridge has Barter 115%. The player has Barter 200% and Master Trader perk.
If the player becomes a Made Man for any family, the barter_mod will be -20.
Now buying a 10mm SMG (1000 caps) from him will be:
barter_percent = (-20 + 100 - 25) * 0.01 = 0.55
barter_ratio = [(115 + 160) / (200 + 160)] * 2 = 1.52778
price_on_table = 1000 * 1.52778 * 0.55 = 840