What will be the investment over next decade ? (With most return)?

You can tell me a specific company or bond or CD.

That will be I bonds purchased between July 2007 to July 2011. I believe the inflation will be get to high single digit in 2007 and will peak around 12-13 % in 2010 and slow down in 2011. We could see regular unleaded gasoline at average of $3.60 in 2007 and $ 4.90 in 2009, $ 6.10 in 2010. Most US corporations and the govt will be hit severely and stock market will tumble so will the emerging markets like India and China. These will stay depressed till 2011. Therefore best way to gaurantee to stay ahead of curve will be I bonds,

That's like asking for a stock tip with a gurantee. Call a broker.

I read the answer of SCM with some interest.

Because the world economy is completely dependent on the price of oil, there is indeed the possibility of that scenario occurring. Either that or a global economic collapse. Both are distinct possibilities, with the U S energy policy contributing to those possible outcomes.

SCM might have mentioned that oil companies and coal companies have a great deal of potential and also perhaps electric utilities. Under this scenario, you can pretty much kiss automotives and airlines goodbye. Rail transport will be the most economical alternative and should flourish provided there is not a complete economic collapse, which should not be discounted.