1. Food, water, shelter. Lack of these means infrastructure will be tough to setup and you are making it harder on imported human resources.
2. Culture, infrastructure and security. These go hand-in-hand. If you don't understand and play by the rules of the culture, security is compromised, and without security, infrastructure is at risk. Without infrastructure things are much more costly. A less liberal government (one that enforces conviction of drug lords that make security a nightmare) may result in better security and therefore better infrastructure.
3. Resources. Access to labor, materials, etc.
4. Heat. In hotter climates, humans are rewarded physically by not working as hard by the fact that they don't get overheated. This is engrained in almost all of us, but even more so when evolution and natural selection also have rewarded lazy behavior. I will probably get downvoted multiple times for saying this, and it isn't true everywhere, but I believe that it happens and can become a cultural phenomenon. Ever heard of a siesta? I know it is just a "break", right...