system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If commodity prices are at a historic low, why do the costs of everyday goods seem unchanged?
gpt
In general, you are more upset by prices rising than you are happy by prices falling.  Because of this, supermarkets do their best to keep prices as stable as possible, keeping sales inflated when prices are down and cheaper than expected when prices are high, (profiting more when commodities are cheap, and less when they are expensive).

That and the fact that much of the cost is in transit/labor/sales/markup/advertising which didn't get any cheaper.