“How much for this?” consists of an exchange between flea market sellers in Ju de Balle, In Brussels- Belgium, and me as a customer and an object maker. In my process of exchange, I made an attempt to understand diverse value systems of goods and the common exchanges and negotiations operating behind them. The process involved the production of multiple pieces based on the second-hand goods at the market. Following further an attempt for exchange and evaluation by the sellers afterwards. In the end, the display mimicked the market and was organized in accordance with the proposed value of the images.