From a fundamental perspective, if above average GDP growth is perceived, the following happens:
LONG equities due to expected growing earnings
LONG crude oil due to growing demand
LONG copper due to growing demand
SHORT bonds due to expected rise in interest rates
SHORT dollar index due to higher inflation
It is better to decompose the sources of returns for each asset classes and look at it together, instead of looking single factor model (GDP growth) of yours.
Sources of returns for equities: Dividends+reinvestments(stock buyback)+Earnings growth (tied to GDP growth) + PE expansion. Assuming dividends and reinvestments are constant most of the return comes from Earnings growth and PE expansion. PE expansion is one of the main reasons we had spectacular run-up even though GDP growth was inline or slightly negative to long term trend line.
Commodities= GDP growth + Demand and supply shocks. These shocks have outsized effect compared to GDP growth. For eg: Negative supply shock in 70's due to oil embargo, Negative demand shock in 2008, Positive supply shock due to shale in 2014.
Bonds: Treasuries mostly due to term premium and change in interest rates and for long term bonds unexpected changes from inflation (Expected inflation will be priced in). For corporates you need to take into consideration default rates.
For dollar index: You need to consider rate differentials, Changes in expected inflation, Changes in balance of trade and some premium for being world reserve currency.
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