Identical products around the world should fix in the law of one price, which mean that the identical products should sell at the same price around the world. This is because if it is not the same price, the country that sell high price would go to buy the low price product from another country and sell it to their country. Therefore, the country that sell product for low price with get a result in increasing demand which result in increasing in price. The supply for the high price product will be more because people import to sell in country, which result in decreasing in price.
At the result, both countries will sell product at the same price. This will cause the exporter by the rest of the world need to sell the product at the same price (world price). Therefore, we can draw it in the graph as vertical lines while the supply in the country as an upward-sloping and the demand is downward-sloping, but food is necessary product, so the line should be more inelastic. Now we can plot all of this in to a graph, and a graph will look like this. The import is horizontal because of the world price, so they need to supply at this price.
As you can see from the graph, the import is restrict at only the small amount according to Africa, only 5 percent of the food import, which resulting in demand exceeding supply, so we can apply this to the food crisis by trade restriction. Therefore, the price of food is increasing because there is high demand for food than supply in Africa, while the farmer is not encouraging by the government because only a little profit goes to them even though the price is high due to the government policy, so he Africa people suffer from hunger due to the unaffordable price of food.
Not only Africa that face food crisis, but also the world is suffered during 2008. According to Europe, they claim that the world food crisis is because the trade restriction of many countries in the world such as Argentina, Russia, Japan and South Korea. These trade restrictions cause the price of food in the world to increase. People cannot afford the high price. Thus, the food crisis occurs and suffers many countries around the world.
Food crisis occur in the country may lead to other problem. For example, the protest in Egypt also cause by raising cost of food in the country because of trade restriction. In long term solution to solve food crisis should be that the government should not intervene food price because food is necessary product; they choose restrict on the unnecessary product such as cigarette or alcohol instead. 20 million people in Africa are suffering from hunger nowadays due to this food crisis causing by trade restriction.