For sure, technological advancement SHOULD lead to a natural decrease in many prices over time. That isn't the case though because the money is losing value more quickly than the advancements are happening. The fact that even superior (let's say 5x) bread is now more than 30 cents per pound shows that pretty clearly.
And you made me curious too! The loaf of bread on my shelf says 1lb on the label and it was a little over $2 IIRC.