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It seems to me the most sensible way to provide aid, is to hire locals to do the work.Absolutely, that's step number 1.
But of course, it has a ton of negative consequences too. Firstly, lots of these people are not used to having "jobs" or even any real money. So now some of them go to work all day, which means they are away from their families. They also get a lot of money relative to everyone else, so pretty soon they're buying motorbikes, beer and touch-screen cell phones.
So now you have this segment of the community that's "Living like Americans" while everyone else is still in a mud hut. The rich people's quality of life goes down - they don't get much time with their families, they drink too much, they eat badly, they're forced to buy food because they don't have time to grow and cook it, etc. - but paradoxically everyone else wants to be like them.
Basically you start to get all the problems of "Western Society" in a society that has never really had the concept of working for someone else or money.
Then later the work dries up (project finished or more likely runs out of money before complete) and now all these people are as screwed as Americans with no jobs. They're not growing their own food, they can't support their lifestyle (motorbikes, food, toys) and suddenly become very dependent.
In essence, we just turn them into the worst of Western Society, which, from what I saw, is horrible.
The thing is, this problem is extremely, extremely hard, and basically any suggestion solution has very, very real negative consequences. That's why I suggest spending some time and thinking really, really hard about if there is anything to "fix" in the first place. It's also why I think training and possibly some education is about the only things we should be "giving". It means the transition will be much slower than if we just built it for them (or paid them to build it) but in the long run the society will be stronger and better.