one of the many, many, many, many down sides to the high cost of oil is that it costs more to produce food. a few countries have tried raising food prices to cover the increase, to less than resounding praise. rather than panic the locals here, and squeeze already tight household budgets, u.s. food manufacturers have opted to keep prices flat-line while decreasing the quantity in each box, carton, and/or bag.
so if that bag of chips feels a little emptier even than usual, that's because it is. (sold by weight not volume, my ass.)