When we look at the statistics on prices, Japan seems to face with the shadow of Deflation. Last year, the oil price climbed the highest level, so it is natural to get lower than a year ago.
Today, I read one article which mentioned the price of agricultural products will be higher and higher, because the world's population is still increasing. China and India will be richer than ever, and their power to purchase influences the market price.
Yes, it is difficult to imagine it if we look at the domestic charts. We need to take in consideration on the global scale.