Conversation so far:
What is nominal GDP?
Nominal GDP is GDP evaluated at current market prices. Therefore, nominal GDP will include all of the changes in market prices that have occurred during the current year due to inflation or deflation.
Why is nominal GDP not a good measure?
The problem comes when you're comparing GDP across different time periods. Nominal GDP includes “growth” in the value of output due to inflation as well as production

Question: What is the difference with real
Self-contained rewrite: What is the between nominal and real GDP?