Talk:Real gross domestic product
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BetacommandBot 11:33, 6 July 2007 (UTC)
The article does not make clear what is a "real GDP". "Real GDP growth" or "real GDP evolution" is a clear concept (the GDP evolution corrected by the price evolution). But "real GDP" is not. Is it considered real in reference to a previous GDP? Should we convert today current GDP into one calculated with past prices?. I'm not too convinced by this concept.--Pgreenfinch 15:27, 15 October 2007 (UTC)
The confusion is clarified once you look at the units for GDP. Nominal gross domestic product is a flow of money normally expressed in the units of $ / year. To convert between nominal and real GDP:
NGDP = RGDP * ( 1 + Delta P / P ) where Delta P / P is the unitless inflation rate. The change in price level measured in Delta P is assumed to occur over the same time frame as the flow of money represented by NGDP and RGDP. — Preceding unsigned comment added by 220.127.116.11 (talk) 13:12, 15 August 2013 (UTC)
If you want to look at Real / Nominal GDP growth (evolution) you would need look at changes in the inflation rate:
IR (Inflation Rate) = Delta P / P Delta NGDP = Delta RGDP * ( 1 + IR ) + RGDP * Delta IR RGDP = NGDP / ( 1 + IR ) Delta RGDP = Delta NGDP / ( 1 + IR ) - NGDP * Delta IR / ( 1 + IR )^2
If Delta IR is 0 (constant inflation rate) then each period's change in real GDP is simply the change in nominal GDP discounted by the prevailing inflation rate. — Preceding unsigned comment added by 18.104.22.168 (talk) 15:29, 15 August 2013 (UTC)
A chart would be helpful comparing Real vs Potential GDPEdit
It would be very helpful if the page included or linked a chart showing
Log of real GDP vs log of potential GDP (or "Potential output" as the current WP article is disappointingly titled))
with which potential GDP is frequently and most helpfully contrasted.
This page should talk about chained weights and fixed weights, and how real GDP value calculated differs in the two. — Preceding unsigned comment added by 22.214.171.124 (talk) 06:23, 23 September 2012 (UTC)