This is a great question and it can be answered in many different ways. For one thing, recently less land has been designated for agriculture in Japan. As you can imagine, Japan has limited land and lots of people. For this reason, more land is used for various businesses and industries, which means less land for cultivation. Only 19,000 square miles are used for farmland, which is extremely small for Japan's population of 127,500,000 people. Consider the United States, which cultivated 39,000 square miles in 15 years. And the United states has 51,000,000 square miles of rural space. In light of this, Japan will have to import food, which the government will have to regulate. Also as food prices increase, this will cause strain on the government.