Quarter-on-quarter Real gross domestic product (chained volume measure of GDP)increased by 1.7percent in the first quarter of 2026 compared to the previous quarter. Realgross domestic income(GDI)increased by 7.5 percent compared to theprevious quarter. Onthe expenditure side,private consumption grew by 0.5 percent,asexpenditures on goods (e.g., clothing) increased. Governmentconsumption rose by 0.1 percent with increased expenditures ongoods. Constructioninvestment rose by 2.8 percent as building construction and civilengineering both increased. Facilitiesinvestment rose by 4.8 percent,as machinery and transportationequipment both increased. Exportsincreased by 5.1 percent,as exports of IT items(e.g.,semiconductors)increased.Imports were up by 3.0 percent,mainly due to increases in machinery&equipment and in motor vehicles. On the production side, agriculture, forestry & fishing expanded by 4.1 percent,mainly due to an increase in crop yields. Manufacturingexpanded by 3.9 percent,centered on an increase in computer,electronic & optical products. Electricity, gas& water supply increased by 4.5 percent,largely as a result ofan increase in water supply, remediation activities. Constructionexpanded by 3.9 percent as building construction and civilengineering both increased. Servicesexpanded by 0.4 percent,centered on increases in finance&insuranceand in cultural & other services. Year-on-year RealGDP(chained volume measure of GDP)increased by 3.6 percentyear-on-year in the first quarter of 2026. National Income Statistics 1. Scope of Measurement The national income statistics estimate total economic activity in Korea (i.e., the productionandexpenditures of all economic agents,including households,enterprises,and thegovernment). Production boundary: goods are counted as output even when they are not meant for sale(e.g., when they are for self-consumption); whereas in the case of services, non-paid domesticworkand personal services(e.g.,for self-consumption)are excluded from the productionboundary. Illegaleconomic activities,such as smuggling,gambling,and prostitution,are likewisecurrently not included in national income, even though they should be captured as productionactivities for a comprehensive measurement of production and expenditures. 2. Methods of Measurement Estimationunder the output approach(production-side national income)is carried out asfollows. Nominalvalue-added is derived by first estimating the values of output and intermediateinput and then subtracting the value of intermediate input from that of output. If the value ofthe intermediate input cannot be determined separately, it is calculated using the value-addedratioobtained from the Bank of Korea’s quarterly and annual financial statement analysisreports. Statisticsunder the expenditure approach(expenditure-side national income)are estimateddirectly using a variety of raw data on the amounts of money spent on final products. Statisticsunder the income approach(income-side national income)are estimated using avarietyof raw data on the distribution of nominal value-added generated by production.Operatingsurplus,in contrast,is calculated by subtracting compensation of employees andother components from the nominal value-added calculated under the production-side approach. Thethree sets of national income statistics,one estimated via the output approach,thesecond via the expenditure approach, and the third via the income approach, should thereforebeidentical.Due to differences in the data used and the methods of estimation,however,statistical discrepancies may occur, which are identified on the expenditures side. 3. Dissemination The Bank of Korea officially announces five types of sequential national income statistics:“advance”and“preliminary”quarterly estimates;and“Gross National Income(preliminary),”“National Accounts (preliminary),” and “National Accounts (final)” annual estimates. The“advance”quarterly estimates are released within 28 days of the quarter’s end,andgive the first look at Korea’s real GDP, including the rates and amounts of growth by typeof economic activity and by component of expenditure. The “preliminary” quarterly estimatesprovidemore detailed analyses(e.g.,of GDP valued at current prices by type of economicactivityand by component of expenditure,and of GNI and savings and investment ratios)within 70 days of the end of the quarter. Various consolidated accounts, sectoral accounts and supporting tables are published in the“GrossNational Income(preliminary),”“National Accounts(preliminary),”and“NationalAccounts(final)”annual estimates.“Gross National Income(preliminary)” is released aroundthreemonths after the relevant year has ended.“National Accounts(preliminary)”and“National Accounts (final)” are released around six months after the relevant year has endedand six months after the following year has ended, respectively. 4. Notes on Statistical Use Dueto the non-additive characteristics of r