It is information received from surveys of purchasing managers regarding the producing industry. It helps to follow the changes in new production orders, volume of industrial production, employment, amount of supply orders and, supplier efficiency. Readings below 45-50 tell about reduction in economic development. ISM Index (NAPM) USA is often influenced by emotion factors, rather than the actual situation. The state of California is not taken into account when calculating ISM Index. This indicator is carefully followed, because the volume of industrial production is not automatically a source of consumer demand. The indicator has significant forex market influence. A value increase of this index leads to the US dollar rate growth. The data on ISM Index (NAPM) is published on the first business day of each month.