Can I try and convince you why that's not a good idea?

Let's say you and I agree that a day's wages is worth 30 or so units of my currency--well pick any value, it doesn't matter for this example. And yet the currency keeps growing in value week over week. Should I not be paying you less and less over time? If the currency increases in value 7% in a month, should I not decrease your pay proportionally?

And are you really going to negotiate that day-to-day, week-to-week, month-to-month, year-to-year? What if the value drops significantly in the middle of the day? What do I pay you at the end of the week?

After all, the value of the currency is going up. I didn't decide the value of your labor was going up. It's staying the same.