There are obviously a lot of places that you could live a decent life only with $1500/month and it doesn't have to be a developing or an underdeveloped country. Essentially any country that (1) hasn't been plagued with Capitalism and (2) has good amount of natural resources so it doesn't have to import much (3) has a production based economy (opposed to credit based economy) would have a low cost of living.
But cost of living is only a small part of what you should be looking for if you want to migrate there. I'd say the biggest challenge is the cultural differences. For example if you go from US to Canada, there won't be that much of a difference but if you go from US to Asia then the difference could be massive. That's on top of the language barrier. You may not be able to fit in or accept the new culture.
I'd say Iran is the only developed country with the lowest cost of living. Iran is also among the top 20 biggest economies and checks all 3 boxes (not plagued with capitalism, has high natural resources and is the most independent country when it comes to production of most the nation's needs). Part of the reason for the lowest cost is the exchange rate.
If I tell you my utility bill you won't believe me. I just paid a total of about $4.9 for phone, internet, mobile, gas, water and electric bill. And that's for 2 months not one since bills come every 2 months
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But then the internet speed is considered low in Iran specially these days mobile data is bad since the number of users is growing a lot faster than the infrastructure has been able to grow (90% of the 85 million own at least one phone actively connected to 4G).
Real estate cost depends a lot on the location. In the capital the price is ridiculously high, in some cases are higher than most expensive ones in Europe. But if you don't need to live close to work for example, and just want to build a villa and enjoy life in the beautiful 4 season country lower prices could be found.
If I wasn't so busy with my job I would have already bought a land and started building my own modern villa. By my initial calculations, somewhere close to the sea in Northern Iran a 1000 sq meters land and the cost of construction, etc. would be between $350k to $500k.
I own an apartment so I don't have any rent, unfortunately the rents could be very high and would eat through one's salary. I also don't pay any taxes because I live in a tax heaven! So I'd say my cost of living is about $50 a month. Of course that doesn't account for the extra shit I buy. For example I recently bought a new sofa set with handcrafted wooden tables, etc. that set be back a grand.
I believe the minimum wage is somewhere between $110 to $130 a month for workers. But an engineer with masters degree like me is paid from $250 to $500 a month. (I think I'm converting stuff correctly to USD although it's late at night and I'm tired lol).
The medical system here is excellent and the costs aren't that high. In fact this has turned Iran into an excellent choice for I think is referred to as medical tourism.
The food here is fantastic too. None of that genetic crap that has no tastes and induces cancer. 90% of the food is organic and cheap. Since someone mentioned rice above, the top quality Persian rise costs $2.66 per kilo although the one I buy is from Southern Iran with a unique taste and aroma that costs $1.66 per kilo ($16.6 per bag).
Speaking of food here is Iran from point of view of a tourist focusing on the wide variety of foods:
https://www.youtube.com/playlist?list=PL_YfaTnGXmTH6XJOo143UzIXkRLcUgtEgAs far as safety goes Iran is considered more secure than European countries like France or the UK.
But of course not everything here is hunky-dory. I mentioned some stuff I could think of above but I think we could say one of the biggest issues that has plagued the country has been weird inflation. For example real estate price went up 14% this week in the area where I live for no reason
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The other problem is of course sanctions since Iran has been the most sanctioned country in the history for the past 43 years. I think we hit the record of 5000 sanctions last month ... woot woot.
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That could cause problems at times. For example price of computer hardware skyrocketed but they came back down slowly or during 2019-2020 when the pandemic began there was a lot of shortages which we couldn't import like ventilators but almost all the time this ends with domestic production followed by quality control and finally exports to compete on the global market with a higher quality but lower price product. (We currently export advanced medical equipment to 55 countries.)
I can't think of anything else but feel free to ask.