The Index is calculated on the basis of purchasing managers’ survey. The aim of the survey is to estimate the changes that have occurred in this economic sector during an accounting period. The numbers of the Index lower than 50 characterize a start of deceleration in economic development and exert a negative influence on Euro. Not only psychological factors but factual businesses state in service field influence greatly the value of final index. The process of consumption of services tends to vary with constant speed, and that is why psychological factors influence greatly the value of this indicator.
