Just mentioning it as a third-world country isn't enough to make a valid comparison, as living fees for food and the like is higher in some of these countries than the US (Although housing is much cheaper, but food is more expensive than "walmart and pricetag like prices".
Could you give an example? Most of the time housing and food are going to be a lot cheaper in a third world country than in any first world country, the things that dont change in price are things like technology and in fact technology can be a lot more expensive since it needs to be imported from other countries where that stuff is built.
In those third world countries where there is a lack of food then n these third world countries you will find food at a high price while in some fertile countries the food is also available with cheap price and in these places we often see the price of land higher.