Indonesia is the top country by real gross capital formation in the world. As of 2015, real gross capital formation in Indonesia was 1,309,751,149 million volume, LCU, 2005 prices that accounts for 34.59 % of the world's real gross capital formation. The top 5 countries (others are Iran, Viet Nam, Republic of Korea, and Colombia) account for 86.83 % of it. The world's total real gross capital formation was estimated at 3,786,235,294 million volume, LCU, 2005 prices in 2015.
Gross capital formation (also known as gross domestic investment) consists of outlays on additions to the fixed assets of the economy plus net changes in the level of inventories. Fixed assets include land improvements (fences, ditches, drains, and so on); plant, machinery, and equipment purchases; and the construction of roads, railways, and the like, including schools, offices, hospitals, private residential dwellings, and commercial and industrial buildings. Inventories are stocks of goods held by firms to meet temporary or unexpected fluctuations in production or sales, and 'work in progress'. According to the 1993 SNA, net acquisitions of valuables are also considered capital formation.