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.
GDP-linked bond
GDP-linked bonds are a form of floating-rate bond with a coupon that is associated with the growth rate of a country, just as other floating-rate bonds are linked to interest rates, such as LIBOR or federal funds rate, or inflation rates, which is the case of inflation-indexed bonds. These securities can be issued to reference real GDP, nominal GDP or aspects of both. In some cases, however, these securities may not have any principal claim and the notional is only used as a basis for calculating the investor's share of payments.