The happy days are over and we cannot have a good prediction for the end of this recession. Energy demand is highly correlated with economic growth. For developed countries, energy demand growth is less than the economic growth, on the other hand for developing nations it may be more than the economic growth.
So to forecast energy demand, oil prices and new investment cycle, economic forecasts are very important.
Recently website has a very interesting post to read. It may need some econometric background but the main point is quite clear. Will the rebound from the recession start with a big jump or just average?
Answers vary, and if you read the post and relevant links, there are two explainations:
1. It will be higher than normal : (Trend stationary)
"suppose that the economy is down because people are postponing the purchases of cars and other goods out of fear. That would be a trend-stationary story, because it suggests a nice rebound when people get over their fear."
2 . It will be just around average: (Unit root)
"Suppose that the economy is down because we accumulated the wrong types of physical capital (houses) and human capital (skills in mortgage securitization). That is a unit-root type problem. Yes, the economy will start growing again at some point, but that misallocation of physical and human capital is a permanent loss. We are not going to make up for it with some above-normal growth."

The detailed explanations and models worth reading:


A simple regression of log GDP on a time trend and lagged log GDP, over the 1967q1-08q4 period yields the following:

yt = 0.424+0.0004time + 0.945yt-1

Where Adj-R2 = 0.9995, SER = 0.008

The AR1 coefficient of 0.945 (se = 0.03) implies a half life of 12.25 quarters, or slightly over 3 years for a deviation from output. Since AR coefficients are biased downward, this is a downwardly biased estimate of the half life.

Brad de Long's Blog

A more technical article about this issue:
Unit root or trend stationary
from Greg Mankiw's Blog
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