The best, and only Barometer (for some of us, at least) of the Commodity demand/Price Movement is the Ausie $. Yes, our Humble Ausie is the World Currency Bellwether as far as Commodities are Concerned, even better a measuring, of Commodity Demand-prices, Instrument , than the Canadian $, short and medium term.... If our Currency goes up (as it does now - Today up to 1,075, from 1,073 US$ on Thursday) Commodities in the main also go up.
A Classic Paradigm (required inclusion in International Economics-currency Movements Books), was our Ausie's Dive from 98 cents to the high ,70s Before, Or as the GFC was unfolding, so did Commodity Prices and of-course Demand..... With the Recovery of the World Economies and as result Demand of it,(recovery),Demand for Commodities and Our $$ Started Moving Upwardly (almost in in Parallellines), thus leading prices for all Commodities, from Iron Ore to ... Pork Bellies to move to new record highs... So, in a nutshell: Watch our Ausie's daily fluctuations.... As long as it stays at present levels (or higher), rest assured Commodities Will always be in Command! And, as Economics 101 teach us: Higher Demand=Higher Prices!!!