Gross domestic product
Gross domestic product (GDP) is a monetary measure of the market value of all the final goods and services produced in a period of time, often annually 
GDP (nominal) per capita does not, however, reflect differences in the cost of living and the inflation rates of the countries; therefore using a basis of GDP per capita at purchasing power parity (PPP) is arguably more useful when comparing differences in living standards between nations.
Modified gross national income
By 2014, Irish GDP had inflated to 130% of Irish GNI, whereas for the EU–28 aggregate , GDP is equal to GNI. In October 2016, Ireland announced that GDP rose 26.3% in 2015, implying Irish GDP was over 150% of Irish GNI. The 2015 growth was due to Apple's Q1 2015 restructuring of its hybrid–double Irish BEPS tool, then under investigation by the EU Commission for illegal avoidance of Irish taxes during 2004–2014, into a new capital allowances for intangible assets Irish BEPS tool (known as the "Green Jersey"). Nobel Prize-winning economist, Paul Krugman, labeled the 2015 GDP growth, since revised to 34.4%, as "leprechaun economics".