“According to Hidenet, a leather markets research firm, a hide from a branded cow went for as little as $4 the week of July 15, down from as much as $81 just five years ago.” Wait, what? Consumer trends have shifted so radically in 5 years that even with a white hot economy leather prices have dropped by 20x?
Beef and hide are coupled goods. One cow produces about X kg of beef and Y m^2 of hide. If demand for beef is extra high, then it will depress the price of hide because the ratio in supply is roughly fixed between them. There are other examples in modern society. Chlorine and caustic soda are produced in strictly fixed ratios from NaCl salt and electricity. Extra demand for one will depress the price of the other. Th…
And so they have been fracking more liquidy "wetter" natural gas where possible, depressing prices for ethane, butane and propane (but which are still more profitable than methane, BTU for BTU).
Cheaper ethane = cheaper plastics as we turn on more and more polyethylene plants (easier to store/ship).
In the winter, we can froth up gasoline with butane, which is largely why winter gas is cheaper.