1 Kilo loaf of bread for under 1 Sat or we haven't arrived yet.
In 600 B.C. using 1 oz of gold you could buy 350 loaves of bread weighing 1 kilo each. This is the benchmark.
Why do we use bread as the benchmark? Because it's a simple manufactured product that requires a few inputs and some Human labor, and we know the price for 1 kilo of the finished product going back millennia.