The study compared two different models to predict output in various sectors of the economy in Turkey and other countries. The demand-side model was better at forecasting total output, while the supply-side model was more accurate for specific sectors like agriculture and mining. However, the demand-side model performed better for construction in Japan, Italy, and Turkey, while the supply-side model was more accurate for the UK and US. Differences in sector forecasts may be due to how data was grouped together.