Prices Yo-yo-ing

I've commented a couple of times of the Zimbabwe-esque price rises on Sainsbury's basics curry sauce (most recently here). In fairness, I should say that when I went shopping the other day it had fallen again to 19p - maybe they were moved by attracting negative publicity?!

Unfortunately, this price unpredictability means purchasing decisions are fraught with uncertainty - should I buy now, or will prices go down further? Or up again? If you're expecting falls, then it's almost like the Ever Better Wine paradox.

Anyway, forget penny share trading: curry sauce futures is where it's at...