Question: I am from Madagascar. We are in what is called a "povery trap".
Building a business is very difficult because the population is agglomerating in the capital and the competition is very high. Moreover, there is a lack of public infrastructure that freezes the economy.

What do you suggest me to do as a citizen without any governmental control to have a good impact in the economy?

Answer: 
I think the best way for an individual citizen to improve their country's economic development is to raise their productivity, while also following ethical standards. "Raising productivity" is a very traditional economic viewpoint, and it basically requires one to move away from rural or subsistence living and towards activities that contribute to society, as measured by the income that you generate. But, I think there also needs to be a focus on long-term developmental outcomes, which may not necessarily be tied to economic profit because of negative externalities.

I haven't done a lot of research into the lives of poor people, but after reading some chapters from Banerjee and Duflo's *Poor Economics*, I would say that the economy loses out when people are not persistent, motivated, or when they make economically irrational decisions. For example, poor people in India do not use the most cost-effective treatment for diarrhea (rehydration liquid with salt and sugar) because they do not trust and are not accustomed to Western medicine. Another example is that poor people in Morocco who can't afford food buy televisions, but I understand the reason for this. The reason is that poor people cannot be expected to cut out all luxuries in their lives, because they also need things that make their life bearable and pleasurable. If poor people didn't buy expensive food and other luxury items, the generations below them might rise out of poverty sooner, but such a process takes a long time. Income-earners would not want to forego a better life for themselves just so that their children's children will not live in poverty.

All in all, I advise you to become a change agent in your community. Strive to motivate others to do work. Technology will help, so you will need to try to find out what the most technologically advanced way of doing your work is. That knowledge comes with education, which may be difficult to access in your situation, but nevertheless try to find it. Lastly, public participation in governance is important for economic development, so try to actively participate in your country's governance.
The best kinds of economic stimulus come with making people better at making businesses locally and internationally.

1/Making skilled tradesmen, new trades, apprenticeship schems, education
2/Making communication with distant rich markets
3/Building organized advanced civil services (town halls, post boxes, churches, police houses) in buildings that encourage fair play and national cooperation.

For the first issue, That is probably where you can intervene...
Education ranges from... giving children dinosaurs and science things to see with their eyes and lego bricks and maths books and soduko... To teaching young and old people trades like: Online Salesman, Treck Guide, Jewelry Fabricator, Honey Farmer, Agricultor... Using modern technologies and latest advances from other countries, for example, you supply some young men with bee-hive construction guide and keeping guide information. 
Mostly you have to find knowledge to do things better from international information sources of researchers of every trade, which means that you have to be able to PRINT information and distribute it... Give people interesting papers to read with plans, techniques, products, on very cheap newspaper. A truck load of paper and a printer is good for printing guides about business development, you can apply abroad for a truck load of paper and a printer. 

2/the second is also a trade, it's like pairing cities up, so that a city in madagascar sais what resources it his and what knowledge it has, and a city in denmark sais what knowledge and resources it has, and they exchange communicationto make direct business expansions based on common interests, like vanilla or something to all the local shops, or local crystals. 

3/it requires investment, but every country should have a prestigious nice architecture for post boxes and town halls and government buildings and police which help for nationality, civility, pride to avoid corruption, and that requires architecture adn funding.