It is a mistake to believe that imposing barriers on inputs into value chains, for example by restricting the export of raw materials, will help spur competitive value-adding within the domestic economy, thereby allowing producers to “capture” the value created in upstream processing. Such policies only increase the final price paid by consumers, with little influence on producer returns and domestic food security. This helps place downward pressure on world prices, which is particularly important for accessibility when demand is rising, w'hen a country’s domestic production is becoming more variable, and when climate change may lead to permanent (and unknown) shifts in comparative advantage.