Furthermore, "actual" or "real-world" market prices are complex entities. As Koray Caliskan (2003, 2004) points out in a delightful ethnographic discussion of cotton trading, markets abound with prices and price quotations of many kinds. What gets reported as cotton's "world price," for instance, is a complicated construction involving not only averaging but also subjective adjustments.

Donald MacKenzie, An Engine, Not a Camera, loc. 103