China has been growing rapidly for almost forty years, mainly due to high levels of investment. The country has been investing a lot in various sectors of its economy, but there are concerns about how long this can continue. The data on China's investments are not very reliable, making it hard for researchers to understand the full picture. Despite this, China's economy is big enough to support development in all sectors. Foreign investment in China is not as important as it used to be, showing that China's growth is mostly driven by its own domestic investments.