You’ll need to change the multiplier at the end of the commodity string
From market_commodities.ini
[BaseGood]
base = Br01_01_base
MarketGood = commodity_gold, 0, -1, 150, 500, 0, 1.08 <== multiplier
From goods.ini
[Good]
nickname = commodity_gold
msg_id_prefix = gcs_gen_commodity_gold
equipment = commodity_gold
category = commodity
price = 425 <== price of commodity
combinable = true
good_sell_price = 2.04
bad_buy_price = 2.04
bad_sell_price = 0.84
good_buy_price = 0.84
shop_archetype = Equipment\models\commodities\nn_icons\cwire_rawmats_2.3db
item_icon = Equipment\models\commodities\nn_icons\COMMOD_metals.3db
jump_dist = 7
So, on planet New London, the price of gold is 425*1.08 = 459cr
The rest of the string indicates that this commodity is SOLD on this base.
Change the string to:
MarketGood = commodity_gold, 0, -1, 0, 0, 1, 1 and the base will BUY the commodity at the multiplier, in this case, for 425cr (multiplier = 1)