You need to earn 1000 coins on the resale of craft items. Earnings are considered as the sum of all the differences between the price at which you bought any item on the market and the price at which you sold. Only items from the craft category are counted. If the quantity sold does not match the quantity bought, then the minimum quantity is taken for the sum of all transactions. If during the resale process, you are generally in the red - the task is failed.