Hello Soumik,

I apologize for not being more clear. I have a spreadsheet in which I have the 15, 16, 17...25 year rolling average population growth. I calculated an average for each year's effect on the economy, then calculated a final average. Note: if I were doing a time series analysis I would not have used this technique. But for the above piece I was trying to describe a general effect that population growth has on the economy, rather than a specific effect in one year. Does this make sense? Put another way, I was trying to relate a "rule of thumb" about the effect population growth has on the economy.

I hope that helps...I am pleased that you liked the piece.

With smiles,

Jason