In a future where every purchase reveals more about who you are, "Data Supermarket" explores how consumer information has become a valuable economic asset. Among smart shelves and loyalty apps, each choice from organic items to shopping times is monitored by RFID technology and transformed into data. With the documentary The Great Hack as a recommendation, the text prompts us to question to what extent our preferences are truly under our control and how this information shapes the market while compromising our privacy. After all, when you scan a barcode, who’s really in control?