Sell Price Multiplier
Sell Price Multiplier is a stat: A multiplier on the price at which you can sell items. Its default value is 100%.
Works of art (sculptures) have a 1.1 multiplier (110% market value), weapons have a 0.2 multiplier (20% market value) and furniture has a 0.7 multiplier (70% market value). The default value for all other items (including materials, food, apparel etc) is 1 (100% market value).
The multipliers make it more difficult to farm raids for profit, because weapons dropped by dead enemies are not valuable in trade. It also means that crafting weapons in your colony only makes sense for personal use, and not for selling.
The game encourages creating art for sale, as it is about 57% more profitable than all other items.
Trading comes with additional modifiers, normally 60% when selling and 140% when buying; these modifiers are unrelated to the sell price multiplier, and applied independently.