Determining the richest country in the world can be a complex task, as it depends on various factors such as gross domestic product (GDP), GDP per capita, and other economic and financial indicators. The wealth of a nation can be assessed in different ways, leading to varying results. When considering GDP per capita, which is the GDP divided by the population, small and wealthy countries like Luxembourg, Qatar, and Switzerland often rank highly due to their high income levels. In terms of GDP, the United States, China, and Japan are among the world's largest economies. The mention of Congo (DRC) and Zambia in relation to wealth might be due to their significant reserves of natural resources, including minerals and metals. However, it's important to distinguish between a country's natural resource wealth and the wealth of its population. While a nation may have valuable resources, the distribution of that wealth and the overall standard of living for its citizens can vary widely. To determine the richest country based on your criteria, it's crucial to specify the measure you're interested in, such as GDP or GDP per capita, and then refer to the most recent data sources for accurate information.