A deposit-refund system (DRS), or advance deposit fee', is a surcharge on a product when purchased and a rebate when it is returned. A well-known example is when container deposit legislation mandates that a refund is given when reusable packaging is returned. Deposit-refund system are a market-based instrument to address externalities. As with Pigovian taxes a DRS aims to limit pollution of various types by creating an incentive to return a product.