That's simply not true at all. Except for a very narrow range of commodities price is very weakly correlated with production costs. The difference between a $10 steak and a $300 steak is not correlated with the energy used to produce either (in fact it may be negatively correlated, as the cheaper steak is likely to come from more industrial agriculture). And even production costs are rarely correlated with energy consumption (only for certain raw materials like aluminium, steel, and those tend to be produced in countries with cheap / subsidised energy).