Gross Domestic Product (GDP) is the total value of all goods and services produced within the borders of a particular country for a given time period (usually one year). Volunteer work or work performed "under the table" or in exchange for other goods or services is not included, so the GDP results can be under-representative of the true size of an economy. Generally speaking, an increase in GDP in the current year when compared to the previous year is seen as a positive indicator of greater employment and higher incomes.