Over sandwiches and pizza, a group of high school students here debated the pros and cons of combating poverty in five desperate nations. They scrolled through Web sites, analyzed statistics and considered how much they knew about the economy, language and culture of each country. This was no mere academic exercise. The students, at the Meadows School, have real decisions to make and, they hope, real people to rescue. By the time they scattered after their lunch period, the group had deferred until next month the decision on where to spend the $25,000 they had raised, but seemed to be leaning toward Peru. That may seem like a lot of money for a student group, but it was the entry fee for the school to become investors in Pro Mujer, a nonprofit lending institution based in New York that issues small loans to poor women in foreign countries to use for buying tools to start or expand small businesses. In raising the money and investing it with Pro Mujer, the Meadows School is by all accounts the first high school to operate a microbank. The founder of the Meadows Microcredit Action Group, Justin Blau, 17, and its faculty adviser, Kirk Knutsen, have bigger plans for their endeavor. Pro Mujer will mete out the $25,000 to recipients in the country the students select and return to the school both regular status reports as well as a modest amount of earned interest. The group plans to use that interest and other money raised locally to invest in smaller, more specific projects through Kiva, another microfinance lender, with no minimum entry requirement.