Inflation is not only due to the sale of minerals, but because the country that sold its resources does not see this money because it settles in the pockets of officials who do not want to develop business in their countries by building new enterprises and giving their people new work.
It is just known that there are enough resources for everyone in the world. Don't get me wrong I am not going to go full communist on you and tell you that everyone should own a lambo of their own, this is not like that. However, if people are starving to death then saying maybe we have enough resources not to let that happen is not communism.
People should learn the difference between helping people out and communism, if you are helping people not starve to death, you can still be capitalist, it is literally just food so they can live some more instead of die, otherwise keep making your Tesla cars and sell them months ahead of schedule in pre-order or keep making your workers work 16 hours a day in a warehouse without extra pay for extra profits of your amazon share holders, those capitalist horrible stuff could still go on (hopefully they shouldn't) but at least make sure people are not hungry.
It comes to nation to nation helps, if a country is too poor to stay alive like Venezuela and Yemen has been going through and people are literally losing weight because they can't find anything to eat, then other nations should send all their extra foods to there.
What you mean by "other nations"? Why not USA help Venezuela? Why they don`t help Yemen? It`s a war out there, and that war is not fair. Big countries are bullying small countries, with bribery and corruption they come and take over for valuable resources, minerals, oil, precious metals, or just because strategical position.
Nike, Nestle, H&M, Philip Morris and many others still use child labor, to not mention that this big companies from big countries are paying minimal to people who works for them in this underdeveloped countries. Therefore we can assume that underdeveloped countries will never be free from big countries, when ever people decide to fight against it, big countries come with big, well armed armies.