It’s an average weighted index composed of such economic indicators as Production Orders, Jobless Claims, Average Workweek, Money Aggregate, Stock Index, Building Permits, Durable Goods Orders and Consumer Confidence Index. LEI Index is used to define economic development for the following six months. It is proved that if in the duration of three month the value of index is negative, it tells about reduction in economic development. The indicator has limited online forex market influence, because it is published a month after publishing of main indicators. A value increase of this index leads to the US dollar rate growth. The data on Leading Indicators (USA) is published in the first decade of each month.