You have said it, in "your country banking sector is very bad", same as inflation is different in every country. OP cant speak for everyone. According to Google, Argentina and Turkey has highest inflation $ last year. In those countries it is really unwise to hold money and do nothing with them. Any Chinese who lives in China, with 0.1% annual inflation can sleep peacefully.
There are many countries with very low inflation rates, such as:
- Switzerland: 0.6%
- Sweden: 0.8%
- Singapore: 1.6%
- Saudi Arabia: 1.9%
- Morocco: 0.7%
- Italy: 1.3%
(
source)
So, it's not that every person in this world will have to go through the problem of their wealth losing value over time if we are only looking at it that way.
As to your advice to invest in land, that aint that simple. I think you can just own land and do nothing with, just wait till its value increases. You will be having some expenses as well; taxes, have to maintain land (at least cutting grass).
Investing in and owning land is not that difficult too. The most difficult part is to have enough money to be able to buy land or properties in places that you know have potential to sell higher in the future, and, another very important thing is to make sure that the property you are buying is legally clear. I have seen a lot of people getting in trouble for such things, especially in third-world countries where land-grabbing is a big issue.