Talking about cheap, it is clear that Indonesia is one that is quite cheap even if we search on search engines like Google for example with the keyword "Cheapest Country in Southeast Asia" Indonesia must be in the top 5 or 6 list there because it is indeed quite cheap for the cost of living but on the other hand, this is indeed a double-edged sword because the low cost of living is definitely influenced by various things, one of which is per capita income.
But indeed if I see the potential of the natural resources here, it is indeed very good, but it is very unfortunate that things like this cannot be used optimally because there are several reasons and several influencing factors.

Btw I found something interesting about cheapest living maybe you want to see this for low cost of living reference
although indeed this may not be 100 percent accurate but it is quite interesting to see.