The National Statistical Institute sets out the fourth edition of the Study on the Local Purchasing Power (SLPP). The SLPP contains a set of indicators which aim at characterising the purchasing power for all Portuguese counties. The indicators were calculated from a wide set of 18 variables by means of factorial design. The great advantage of these indicators is that they provide data on counties, a territorial unit for which there is few statistical data available, namely on income and on consumption. The publication also includes a CD-ROM that besides the main tables of the hardcopy also contains the indices for other geographical divisions, such as districts, agrarian regions and tourist regions. The interactive application allows yet calculating the figure for each indicator as well as the population of any group of counties selected by the user.