National Consumer Price Index (CPI) is the key gauge for inflation in Japan. Simply put, inflation reflects a decline in the purchasing power of the Yen, where each Yen buys fewer goods and services. In terms of measuring inflation, CPI is the most obvious way to quantify changes in purchasing power. The report tracks changes in the price of a basket of goods and services that a typical Japanese household might purchase. An increase in the index indicates that it takes more Yen to purchase this same set of basic consumer items.

Markets will typically pay more attention to "CPI excluding Fresh Food," because it excludes volatile food prices that can distort overall CPI. The headline figure for CPI is the percentage change in the index on a month to month or year to year basis.

As the most important indicator of inflation, CPI figures are closely followed by the Bank of Japan. Rising Consumer Prices may prompt the BoJ to raise interest rates in order to manage inflation and slow economic growth. Higher interest rates make holding the Yen more attractive to foreign investors, and this higher level of demand will place upward pressure on the value of the Yen.

Change in the price of services purchased by corporations. It's a leading indicator of consumer inflation - when corporations pay more for services the higher costs are usually passed on to the consumer.

Change in the price of services purchased by corporations. It's a leading indicator of consumer inflation - when corporations pay more for services the higher costs are usually passed on to the consumer.

Change in the total value of inflation-adjusted sales at the retail level with auto fuel. It's the primary gauge of consumer spending, which accounts for the majority of overall economic activity.

A monthly measurement of all goods sold by retailers based on a sampling of retail stores of different types and sizes. The retail sales index is often taken as an indicator of consumer confidence.