Ireland is an open economy (6th on the Index of Economic Freedom), and ranks first for "high-value" foreign direct investment (FDI) flows. Using the metric global GDP per capita, Ireland ranks 5th of 187 (IMF) and 6th of 175 (World Bank). The alternative metric modified Gross National Income (GNI) is intended to give a more accurate view of "activity in the domestic economy". This is particularly relevant in Ireland's small globalised economy, as GDP includes income from non-Irish owned companies, which flows out of Ireland. Indeed, foreign multinationals are the driver of Ireland's economy, employing a quarter of the private sector workforce, and paying 80% of Irish business taxes. 14 of Ireland's top 20 firms (by 2017 turnover) are US-based multinationals (80% of foreign multinationals in Ireland are from the US; there are no non-US/non-UK foreign firms in Ireland's top 50 firms by turnover, and only one by employees, that being German retailer Lidl at No. 41).