What are the problems with the Harrod-Domar model?

The Harrod-Domar model is a simple macroeconomic model used to explain economic development and economic growth. The model has limitations, including the following: 1. It assumes that an economy has only two factors of production, labor and capital. This overlooks other factors, such as human capital and technology, that contribute to economic development. 2. It assumes an economy is closed, meaning there is no international trade or investment, which is not realistic. 3. It assumes a constant rate of investment-savings ratio, which is not always the case in reality. 4. It assumes a constant rate of growth in both capital and labor productivity, which does not consider cyclical fluctuations. 5. It does not take into account structural changes which can affect both investment and savings. 6. It is not a dynamic model, meaning that it does not take into consideration how an economy will react to changes in the future.