Based on what I have learnt so far. Following is my understanding
AHV is there to allow minimum income for people irrespective of what they might have earned during their lifetime. There is some sort of variation but there is a cap on how much one can get.
3a is completely independent and helps people who have higher income. Reason is that only people with higher income have money to invest in 3a.
2nd pillar is kind of mixed bag. Traditional systems were build on defined benefits schemes where employer’s funds were funding the retirement of employees. The system worked well when life expectancy was low and demographics were favourable. Now things have changed and many funds are defined contribution schemes and depend heavily on their configuration of retirees vs contributing members.
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Talking specifically about 2nd pillar. There is a very big variation between funds. Some provide very good interest, some don’t. Some have high conversion (blended) rate, some don’t. Some offer 1e, some don’t.
But if we ignore all the differences, following is always true
- voluntary contributions to any 2nd pillar mainly helps richer people because only high income earners have money to voluntary contribute (benefit being tax savings)
- Marginal income tax % at time of contribution are generally higher than lumpsum tax at time of withdrawal. This again is more probable for higher earners.
- extra mandatory contributions partially support the regulated conversion rate for mandatory contributions. It is not clear what’s the actual impact but I think it depends on ratio of Mandatory pot vs extra mandatory pot at the fund level. I would see this as kind of a payback/tax/redistribution
- Even if there is some sort of support from Extra mandatory to mandatory, what matters in the end is annual interest. Because irrespective of what cross financing is happening, once the interest is credited , then it’s done
- During retirement phase, the decision to withdraw as lumpsum vs annuity would depend on what exactly is blended rate at that time. But no one is forced to take annuity if lumpsum is better
I understand that 1e is easy to understand and it looks better as it is more or less similar to 3a. But it also has it’s disadvantages for an individual because all risk moves to the individual. Most people don’t know how to invest even if they think they do. It also has this problem of transferability as it’s not standard yet. Thus changing employers during bear market can be extremely painful unless laws are changed
This is why rather than looking at fund configuration & offers (as it depends on where you work) , I focus mainly on following to decide if voluntary contribution makes sense or not for me
- Guaranteed interest rate if any . Some funds offer up to 3.5% guarantee , some offer 1.25%
- Historical credit interest rates & coverage ratio of the fund
- Expected returns (in case of 1e offering)
- Estimated lump sum rate at time of withdrawal (I always assume that I will withdraw the capital and won’t take annuity. This is just to keep things simple)
- Marginal income tax rate at time of contribution
- What is my estimated return if I don’t add money to pension system and invest personally after taxes
For a country which is built with direct democracy, is known for its financial system and highly educated citizens, I remain confident that whatever happens in future will not be bad. It might be a bit better for people with lower income and perhaps less better for people with higher income. But in the end if I end up on the side with person with higher income and higher wealth, I will be fine anyhow 
P.S -: I believe pension money is meant for funding last 20-25 years of our life. And this will always be the case. So I don’t count on getting it to fund 40 years of my life. If life expectancy increases, the retirement age will increase too.
P.S -: personally I like 1e system as it brings a balanced approach where base plan takes care of redistribution and 1e is personal.