Investment risk is described with two types of variables (economic and financial ratios):

• efficiency variables (these values are totally dependent on the economic performance of businesses in sectors of the economy),
• structural variables (these values are partially dependent on the efficiency behaviors of businesses in sectors while they are partially dependent on structural determinants).

The sectors of the economy have been divided into two groups:
industrial and non-industrial sectors. The sets of variables describing the investment risk in each group vary to some degree. The sectors of the economy may be depicted with total values or average values for average businesses in the sector.