From the examples posted in the articles it seems to me that 1) can be reduced to the financial part (e.g. microcredit systems such as water.org) and 2) should

From the examples posted in the articles it seems to me that 1) can be reduced to the financial part (e.g. microcredit systems such as water.org) and 2) should come first - you need to create a fertile ground where people can lift themselves up from basic survival mode into some sort of business to sustain their family. Once you have enough people being able to sell services to others, infrastructure should come automatically - probably roughly in the order of maslow's pyramid. The only other infrastructure that might be worth it to boost other than financials is education, since this should be expected to accelerate the growth process.