Update : Oct. 29, 2012
A Leveraged Indicator is an index calculated by multiplying the daily fluctuation rate of the underlying index (TOPIX, etc.) by a certain factor.
Leveraged Indicators have price movements and returns that differ with those of regular indicators. The following is a specific explanation of the traits of, the TOPIX Leveraged (2x) Index.
The graph below shows a case of the underlying indicator TOPIX on the rise. In such a case, the TOPIX Leveraged (2x) Index will have a daily fluctuation rate that is twice that of the underlying indicator.
However, if a period of 2 business days or longer (Base date to 2nd day) is examined, whereas TOPIX rose 15.5% (100 to 115.5), TOPIX Leveraged (2x) Index rose 32% (100 to 132), producing a result that is not exactly 2x the fluctuation rate of the underlying indicator.
In this way, it is possible to aim for higher returns than market gains using a Leveraged Indicator. However, when compared over a period of 2 business days or longer, the rate of increase may differ from the expected fluctuation rate (2x the underlying indicator). The longer the period of investment, the greater the possibility for discrepancy between the fluctuation rates of the underlying indicator and the Leveraged Indicator.

The following graph shows a case of the underlying indicator TOPIX on the decline. In such a case, the TOPIX Leveraged (2x) Index will have a daily fluctuation rate that is twice that of the underlying indicator.
However, just as in Example 1, if a period of 2 business days or longer is examined, whereas TOPIX fell 14.5% (100 to 85.5), TOPIX Leveraged (2x) Index fell 28% (100 to 72.0), producing a result that is not exactly 2x the fluctuation rate of the underlying indicator.
In this way, the Leveraged Indicator produces a larger decline than that of the market. However, when compared over a period of 2 business days or longer, the rate of decline may differ from the expected fluctuation rate (2x the underlying indicator). The longer the period of investment, the greater the possibility for discrepancy between the fluctuation rates of the underlying indicator and the Leveraged Indicator.

Finally, the following graph shows a case of TOPIX experiencing a series of gains and losses. In such a case, the TOPIX Leveraged (2x) Index will again have a daily fluctuation rate that is twice that of the underlying indicator.
However, though TOPIX has returned to the base date’s level by the 3rd day, the TOPIX Leveraged (2x) Index moved from 100 to 98.6, not recovering to the base date value due to its compounded movements.
In cases where the market’s direction is unclear and the underlying indicator repeatedly rises and falls, a Leveraged Indicator’s performance will be gradually decreased compared to that of the underlying indicator due to the compounding effect.

Compared to an ETF tracking the underlying indicator, because the daily fluctuation rate is amplified for an ETF tracking a Leveraged Indicator, the profit/loss will also be amplified.