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.