There has been a lot of talk about peak oil. The arabs refused to increase supply. As the BRIC economies grow at parabolic rates, and infrastructure is still based on crude oil rather than alternative energies, I dont see any bubble.
Being the largest economy on the globe, 70% of GDP depends on the american consumer who is taking a hit due to bad bank and greedy lending practises in the secured and unsecured industry, and the banks recent practises spells their own demise as well. They are not lending! Since consumer recovery is the vital issue to USA recovery,and the banks play the central role, their slow demise puts the US on a road to depression.
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