Pension Funds Conundrum

Pension funds can be divided into two groups: The first group guarantees the purchasing power of members during their retirement while the second group only provides pension to their members. Iranian pension funds fall within the latter group, Nasser Zakeri, an economist, said in an article for the Persian daily Shargh. 
A translation of the text follows: 
Pension funds in all countries are established upon the premise that those who hold a job need to save part of their monthly wage to receive a pension for the rest of their lives once their employment ends. The employed may get a job promotion during their working years and get higher salary and accordingly pay high insurance premiums.