“…In addition, spot prices across different locations of trading might not be the same and therefore the basis could differ across these locations. More discussion of using the price of futures contract with the closest-to-maturity as a proxy of spot price can be found in French (1987, 1988), Gibson and Schwartz (1990) and Schwartz (1997), and Newsome et al (2004). 7 For comparison, daily average trading volumes of the nearest-tomaturity contracts for each of the commodities are 86578, 77034, 2682, 2747, 2746, 3335, 9145, 34414, 3193, and 9686, respectively.…”