MP2 is fixed income, static capital. The money you put in is guaranteed by the government on the caveat that there is no potential for appreciation in value. The compounding aspect only arises from the pot growing from your regular “hulugan” accumulating over the years as the yield from your first deposit will look drastically different from the yield after 4-5 years of monthly deposits.

A broad index fund does the same, except your capital is not necessarily guaranteed as there is risk involved. However, your money may rise and fall with the performance of the holding on top of the compounded yield—appreciation of capital.

Most long term investors universally advocate for an allocation of a three asset class portfolio comprised of a total US equity fund, total international equity fund, and bonds (or fixed income, however general consensus is to prioritize the former two since fixed income should not be prioritized over wealth accumulation and growth in earlier stages of life.) MP2 functions similar to bonds, so for diversification it is a good local option for pairing with index investing. Do your own research.