This study in Nicaragua used a special model to look at how a trade agreement with the USA might affect people's incomes. They used a computer program that sees how changes in big things in the economy can lead to smaller changes in individual people's lives. The research showed that the trade deal didn't make a big difference to the country's overall economy, and it didn't change how money was shared between rich and poor people much. So, the agreement didn't have a major impact on poverty levels or how evenly incomes were spread out.