Inventory can be tracked through barcodes, RFID tags, and QR codes. Barcode tracking is the cheapest and most widely used alternative, as it requires less staffing and investment. However, QR code is also emerging as a widely used concept because it can be scanned through a phone camera. RFID tags require investment and an RFID reader, but it falls among the best alternative to manage asymmetric inventory like automobiles, clothing, etc.