With capital of around $200, I was able to lend out $1425. As a loan was repaid, I would re-lend the funds to a different borrower. Over the years I participated in 39 loans in 24 different countries.

If you have as little as $25 on which you're willing to forgo interest, you could do a lot of one-on-one good in the world. Check out Kiva.org!