Effects of Index-Fund Investing on Commodity Futures Prices

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A Model of Financialization of Commodities (2015, unknown): “Hamilton and Wu (2012) examine whether purchases by index funds had an effect on commodity futures prices and reach a mostly negative conclusion.”
The relationship between energy and equity markets: evidence from volatility impulse response functions (2014, background): “…is cited to support the assertion that speculators have had a significant effect on commodity prices since the early 2000s, although whether speculators have had a material impact on the properties of commodity time series is disputed (Valiant, 2011; Hamilton and Wu, 2012; Vivian and Wohar, 2012).”
Risk Premia in Crude Oil Futures Prices (2013, background): “Unfortunately, the data publicly available on trader positions in crude oil futures contracts have some serious problems (see the discussion in Irwin and Sanders (2012) and Hamilton and Wu (2012c)).”
The Role of Speculation in Oil Markets: What Have We Learned So Far? (2013, background): “The idea of time-varying risk premia also plays a central role in recent work by Hamilton and Wu (2012b) who provide evidence of large shifts in the risk premium after 2005.”