The study looked at how domestic investment and capital formation affect economic growth in Nigeria. They used trend analysis and advanced tests to see if there was a connection between these factors. The results showed that there is a significant relationship between domestic investment, capital formation, and economic growth in Nigeria. They also found that both domestic investment and capital formation cause economic growth in the country. However, the study noted that capital formation did not keep pace with the growth of domestic investment. The researchers suggest that the government should create a favorable environment for domestic investment to grow, which can help boost the economy.