According to some estimates about 20% of the population lives on less than US$1.25 per day. Migration from Tajikistan and the consequent remittances have been unprecedented in their magnitude and economic impact. In 2010, remittances from Tajik labour migrants totaled an estimated $2.1 billion US dollars, an increase from 2009. Tajikistan has achieved transition from a planned to a market economy without substantial and protracted recourse to aid (of which it by now receives only negligible amounts), and by purely market-based means, simply by exporting its main commodity of comparative advantage — cheap labor. The World Bank Tajikistan Policy Note 2006 concludes that remittances have played an important role as one of the drivers of Tajikistan's robust economic growth during the past several years, have increased incomes, and as a result helped significantly reduce poverty.