According to the preliminary data, operating income in non-financial business economy in the Republic of Serbia in the fourth quarter of 2018 increased by 5.4% relative to the same period of the previous year, while compared to the third quarter of 2018, the increase of 9% was noted. Operating costs in non-financial business economy in the fourth quarter of 2018 increased by 7.6% relative to the same period of the previous year, while compared to the third quarter of 2018, the increase of 13% was noted.