On the basis of money can lose value of 33.3% over 15 years, then it might be better to keep money with bank's retirement plan. One plan which I know gives 11% returns per annum lock-in for 15 years.

Assuming you put in 1 mil in the retirement plan, it will give you slightly over 9k passive income per month, after 15years the 9k will be more or less 6k today's worth. You can still lead a comfortable life with that amount with only 1 mil of money.

Assuming that you are not retiring yet, and it will still take another 30years before you retire, then you might need to target for around 2 mil to be available at your retirement age.

What do you guys think ?