Consignment store
The consignment shop is a new lot in The Sims 3: Ambitions. Sims are be able to sell things like inventions, paintings, or gems. It is possible that it could be linked to self employed careers, another feature in Ambitions. Sims can bring paintings, inventions, and sculptures to the shop and put them on display for other Sims to look at and buy. It's necessary to impress them in order to build a reputation. If a Sim's reputation is high, more Sims will buy his or her stuff.
The longer their items are for sale, the more they decrease in price:
1 Day at the shop: Selling price = 200%
2 Days at the shop: Selling price = 170%
3 Days at the shop: Selling price = 130%
4 Days at the shop: Selling price = 110%
5 Days at the shop: Selling price = 100%
If the object(s) isn't sold by the end of day 5, it is returned. Selling the same object frequently will decrease the price and the shop clerk will inform you that customers are getting bored. The more reputation you have the less money the store will take of you for having to stock your items;
0 Reputation = 15% Taken off
200 Reputation = 10% Taken off
4,000 Reputation = 5% Taken off
8,000 Reputation = 0% Taken off
Sims who have the Born Salesperson trait will gain Reputation faster. Also, if your sims has the Suave Selling LTR, then they will sell their goods for more.