A downside to these purchases is that they distort market signals and may encourage illegal imports by inflating domestic prices relative to international prices. Furthermore, storage facilities can entail high costs to build and operate, with continued rotation of stock important for reducing potential storage losses from infestation or moisture damage. Nevertheless, since China’s entry into the World Trade Organisation (WTO) China has sourced more agricultural products from abroad. In particular, net imports of vegetable oils, oilseeds, cotton, sugar and milk products have picked up (OECD-FAO, 2013).