Previous posts have examined how private enterprise can fight poverty through "creative capitalism" and corporate social responsibility. But one old idea made the rounds this week, albeit with a new spin: helping the poor by taxing global financial transactions.

The plan, proposed by Stephan Schulmeister of Austria's Institute of Economic Research, would tax global financial transactions — such as stock trades — at a rate of around one-hundredth of a percentage point. Even at this miniscule rate, Schulmeister estimates that such a global micro-tax could bring in revenue of up to $230 billion a year. Theoretically, this money would be used to finance development aid and projects aimed at helping the poorest cope with problems like climate change and rising food prices.

But the idea is not without its critics. Research from the World Bank notes that while the basic philosophy behind such taxes is economically sound, determining how to redistribute the revenue is likely to be politically problematic. An essay on the Organisation for Economic Cooperation and Development's website also wonders whether micro-taxes are administratively feasible or whether political leaders would actually use the tax revenue for development.

A Brazilian anti-poverty program known as Bolsa Familia ("Family Fund") is getting attention from governments around the world, writes the Economist. Modeled on a similar program in Mexico, this conditional cash transfer program has been tested successfully in several other Latin American countries, and the World Bank is now looking to start similar programs in Eastern Europe.

In the Brazilian version of the program, poor families with children receive direct transfers of around 70 reals (about $35) a month, on the condition that their children stay in school and have regular health checkups. According to the World Bank, this relatively simple and modest program is unique in that it can help reduce both current and future poverty and inequality in Brazil.